feat(core): Initial support for two-way communication over websockets (#7570)

- Enable two-way communication with web sockets
- Enable sending push messages to specific users
- Add collaboration service for managing active users for workflow

Missing things:
- State is currently kept only in memory, making this not work in
multi-master setups
- Removing a user from active users in situations where they go inactive
or we miss the "workflow closed" message
- I think a timer based solution for this would cover most edge cases.
I.e. have FE ping every X minutes, BE removes the user unless they have
received a ping in Y minutes, where Y > X
- FE changes to be added later by @MiloradFilipovic 

Github issue / Community forum post (link here to close automatically):

---------

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/cli/src/Interfaces.ts

@@ -503,58 +503,74 @@ export type IPushData =
 	| PushDataRemoveNodeType
 	| PushDataTestWebhook
 	| PushDataNodeDescriptionUpdated
-	| PushDataExecutionRecovered;
+	| PushDataExecutionRecovered
+	| PushDataActiveWorkflowUsersChanged;
 
-type PushDataExecutionRecovered = {
+type PushDataActiveWorkflowUsersChanged = {
+	data: IActiveWorkflowUsersChanged;
+	type: 'activeWorkflowUsersChanged';
+};
+
+export type PushDataExecutionRecovered = {
 	data: IPushDataExecutionRecovered;
 	type: 'executionRecovered';
 };
 
-type PushDataExecutionFinished = {
+export type PushDataExecutionFinished = {
 	data: IPushDataExecutionFinished;
 	type: 'executionFinished';
 };
 
-type PushDataExecutionStarted = {
+export type PushDataExecutionStarted = {
 	data: IPushDataExecutionStarted;
 	type: 'executionStarted';
 };
 
-type PushDataExecuteAfter = {
+export type PushDataExecuteAfter = {
 	data: IPushDataNodeExecuteAfter;
 	type: 'nodeExecuteAfter';
 };
 
-type PushDataExecuteBefore = {
+export type PushDataExecuteBefore = {
 	data: IPushDataNodeExecuteBefore;
 	type: 'nodeExecuteBefore';
 };
 
-type PushDataConsoleMessage = {
+export type PushDataConsoleMessage = {
 	data: IPushDataConsoleMessage;
 	type: 'sendConsoleMessage';
 };
 
-type PushDataReloadNodeType = {
+export type PushDataReloadNodeType = {
 	data: IPushDataReloadNodeType;
 	type: 'reloadNodeType';
 };
 
-type PushDataRemoveNodeType = {
+export type PushDataRemoveNodeType = {
 	data: IPushDataRemoveNodeType;
 	type: 'removeNodeType';
 };
 
-type PushDataTestWebhook = {
+export type PushDataTestWebhook = {
 	data: IPushDataTestWebhook;
 	type: 'testWebhookDeleted' | 'testWebhookReceived';
 };
 
-type PushDataNodeDescriptionUpdated = {
+export type PushDataNodeDescriptionUpdated = {
 	data: undefined;
 	type: 'nodeDescriptionUpdated';
 };
 
+export interface IActiveWorkflowUser {
+	user: User;
+	lastSeen: Date;
+}
+
+export interface IActiveWorkflowUsersChanged {
+	workflowId: Workflow['id'];
+	activeUsers: IActiveWorkflowUser[];
+}
+
 export interface IPushDataExecutionRecovered {
 	executionId: string;
 }