Feature/sse (#3125)

* Base changes for ServerSide Events (instead of socket.io)

* lint fixes

* adding of interface and separate methods for streaming events

* lint

* first draft, handles both internal and external prediction end points.

* lint fixes

* additional internal end point for streaming and associated changes

* return streamresponse as true to build agent flow

* 1) JSON formatting for internal events
2) other fixes

* 1) convert internal event to metadata to maintain consistency with external response

* fix action and metadata streaming

* fix for error when agent flow is aborted

* prevent subflows from streaming and other code cleanup

* prevent streaming from enclosed tools

* add fix for preventing chaintool streaming

* update lock file

* add open when hidden to sse

* Streaming errors

* Streaming errors

* add fix for showing error message

---------

Co-authored-by: Henry <hzj94@hotmail.com>

packages/server/src/services/predictions/index.ts

@@ -1,13 +1,12 @@
 import { Request } from 'express'
-import { Server } from 'socket.io'
 import { StatusCodes } from 'http-status-codes'
 import { utilBuildChatflow } from '../../utils/buildChatflow'
 import { InternalFlowiseError } from '../../errors/internalFlowiseError'
 import { getErrorMessage } from '../../errors/utils'
 
-const buildChatflow = async (fullRequest: Request, ioServer: Server) => {
+const buildChatflow = async (fullRequest: Request) => {
     try {
-        const dbResponse = await utilBuildChatflow(fullRequest, ioServer)
+        const dbResponse = await utilBuildChatflow(fullRequest)
         return dbResponse
     } catch (error) {
         throw new InternalFlowiseError(