⚡ (openai) Add Messages sequence type

To make it easy to just plug a sequence of user / assistant messages to Chat completion task

Closes #387

apps/docs/docs/editor/blocks/integrations/openai.md

@@ -3,7 +3,15 @@
 With the OpenAI block, you can create a chat completion based on your user queries and display the answer back to your typebot.
 
 <img
-    src="/img/blocks/integrations/openai.png"
+    src="/img/blocks/integrations/openai/overview.png"
     width="600"
     alt="OpenAI block"
   />
+
+This integration comes with a convenient message type called **Messages sequence ✨**. It allows you to directly pass a sequence of saved assistant / user messages:
+
+<img
+    src="/img/blocks/integrations/openai/messages-sequence.png"
+    width="600"
+    alt="OpenAI messages sequence"
+  />

apps/docs/openapi/chat/_spec_.json

@@ -2957,27 +2957,62 @@
                                                           "messages": {
                                                             "type": "array",
                                                             "items": {
-                                                              "type": "object",
-                                                              "properties": {
-                                                                "id": {
-                                                                  "type": "string"
+                                                              "anyOf": [
+                                                                {
+                                                                  "type": "object",
+                                                                  "properties": {
+                                                                    "id": {
+                                                                      "type": "string"
+                                                                    },
+                                                                    "role": {
+                                                                      "type": "string",
+                                                                      "enum": [
+                                                                        "system",
+                                                                        "user",
+                                                                        "assistant"
+                                                                      ]
+                                                                    },
+                                                                    "content": {
+                                                                      "type": "string"
+                                                                    }
+                                                                  },
+                                                                  "required": [
+                                                                    "id"
+                                                                  ],
+                                                                  "additionalProperties": false
                                                                 },
-                                                                "role": {
-                                                                  "type": "string",
-                                                                  "enum": [
-                                                                    "system",
-                                                                    "user",
-                                                                    "assistant"
-                                                                  ]
-                                                                },
-                                                                "content": {
-                                                                  "type": "string"
+                                                                {
+                                                                  "type": "object",
+                                                                  "properties": {
+                                                                    "id": {
+                                                                      "type": "string"
+                                                                    },
+                                                                    "role": {
+                                                                      "type": "string",
+                                                                      "enum": [
+                                                                        "Messages sequence ✨"
+                                                                      ]
+                                                                    },
+                                                                    "content": {
+                                                                      "type": "object",
+                                                                      "properties": {
+                                                                        "assistantMessagesVariableId": {
+                                                                          "type": "string"
+                                                                        },
+                                                                        "userMessagesVariableId": {
+                                                                          "type": "string"
+                                                                        }
+                                                                      },
+                                                                      "additionalProperties": false
+                                                                    }
+                                                                  },
+                                                                  "required": [
+                                                                    "id",
+                                                                    "role"
+                                                                  ],
+                                                                  "additionalProperties": false
                                                                 }
-                                                              },
-                                                              "required": [
-                                                                "id"
-                                                              ],
-                                                              "additionalProperties": false
+                                                              ]
                                                             }
                                                           },
                                                           "responseMapping": {