⚡ 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 -->

apps/builder/package.json

@@ -75,7 +75,7 @@
     "next": "14.1.0",
     "next-auth": "4.22.1",
     "nextjs-cors": "2.1.2",
-    "nodemailer": "6.9.3",
+    "nodemailer": "6.9.8",
     "nprogress": "0.2.0",
     "openai": "4.28.4",
     "papaparse": "5.4.1",
@@ -114,7 +114,7 @@
     "@types/jsonwebtoken": "9.0.2",
     "@types/micro-cors": "0.1.3",
     "@types/node": "20.4.2",
-    "@types/nodemailer": "6.4.8",
+    "@types/nodemailer": "6.4.14",
     "@types/nprogress": "0.2.0",
     "@types/papaparse": "5.3.7",
     "@types/prettier": "2.7.3",