feat(SIP-39): Websocket sidecar app (#11498)

* WIP node.js websocket app

* Load testing

* Multi-stream publish with blocking reads

* Use JWT for auth and channel ID

* Update ws jwt cookie name

* Typescript

* Frontend WebSocket transport support

* ws server ping/pong and GC logic

* ws server unit tests

* GC interval config, debug logging

* Cleanup JWT cookie logic

* Refactor asyncEvents.ts to support non-Redux use cases

* Update tests for refactored asyncEvents

* Add eslint, write READMEs, reorg files

* CI workflow

* Moar Apache license headers

* pylint found something

* adjust GH actions workflow

* Improve documentation & comments

* Prettier

* Add configurable logging via Winston

* Add SSL support for Redis connections

* Fix incompatible logger statements

* Apply suggestions from code review

Co-authored-by: David Aaron Suddjian <1858430+suddjian@users.noreply.github.com>

* rename streamPrefix config

Co-authored-by: David Aaron Suddjian <1858430+suddjian@users.noreply.github.com>

.github/workflows/superset-websocket.yml

@@ -0,0 +1,33 @@
+name: WebSocket server
+on:
+  push:
+    paths:
+      - "superset-websocket/**"
+  pull_request:
+    paths:
+      - "superset-websocket/**"
+
+jobs:
+  app-checks:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+      - name: Install dependencies
+        working-directory: ./superset-websocket
+        run: npm install
+      - name: lint
+        working-directory: ./superset-websocket
+        run: npm run lint
+      - name: prettier
+        working-directory: ./superset-websocket
+        run: npm run prettier-check
+      - name: unit tests
+        working-directory: ./superset-websocket
+        run: npm run test
+      - name: build
+        working-directory: ./superset-websocket
+        run: npm run build