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/components/nodes/chains/VectaraChain/VectaraChain.ts

@@ -269,7 +269,9 @@ class VectaraChain_Chains implements INode {
                 input = await checkInputs(moderations, input)
             } catch (e) {
                 await new Promise((resolve) => setTimeout(resolve, 500))
-                //streamResponse(options.socketIO && options.socketIOClientId, e.message, options.socketIO, options.socketIOClientId)
+                // if (options.shouldStreamResponse) {
+                //     streamResponse(options.sseStreamer, options.chatId, e.message)
+                // }
                 return formatResponse(e.message)
             }
         }