⚡ Introduce a new high-performing standalone chat API (#1200)

Closes #1154

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
	- Added authentication functionality for user sessions in chat API.
- Introduced chat-related API endpoints for starting, previewing, and
continuing chat sessions, and streaming messages.
- Implemented WhatsApp API webhook handling for receiving and processing
messages.
- Added environment variable `NEXT_PUBLIC_CHAT_API_URL` for chat API URL
configuration.

- **Bug Fixes**
	- Adjusted file upload logic to correctly determine the API host.
	- Fixed message streaming URL in chat integration with OpenAI.

- **Documentation**
- Updated guides for creating blocks, local installation, self-hosting,
and deployment to use `bun` instead of `pnpm`.

- **Refactor**
	- Refactored chat API functionalities to use modular architecture.
- Simplified client log saving and session update functionalities by
using external functions.
	- Transitioned package management and workflow commands to use `bun`.

- **Chores**
- Switched to `bun` for package management in Dockerfiles and GitHub
workflows.
	- Added new Dockerfile for chat API service setup with Bun framework.
	- Updated `.prettierignore` and documentation with new commands.

- **Style**
	- No visible changes to end-users.

- **Tests**
	- No visible changes to end-users.

- **Revert**
	- No reverts in this release.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/bot-engine/package.json

@@ -25,9 +25,10 @@
     "google-auth-library": "8.9.0",
     "google-spreadsheet": "4.1.1",
     "got": "12.6.0",
+    "ky": "^1.1.3",
     "libphonenumber-js": "1.10.37",
     "node-html-parser": "6.1.5",
-    "nodemailer": "6.9.3",
+    "nodemailer": "6.9.8",
     "openai": "4.28.4",
     "qs": "6.11.2",
     "stripe": "12.13.0",
@@ -36,7 +37,7 @@
   "devDependencies": {
     "@typebot.io/forge": "workspace:*",
     "@typebot.io/forge-repository": "workspace:*",
-    "@types/nodemailer": "6.4.8",
+    "@types/nodemailer": "6.4.14",
     "@types/qs": "6.9.7"
   }
 }