Bun support (#80)

* introduce CliCoreBase.ts to remove all Node repl dependencies, allowing future REPL to be built without using Node REPL. Small change to stringify so that Timer objects are recognized in Bun. Add couple Bun detectors in tests to work around Jest specialties that are not availavle in Bun. Add github actions so that all tests run on Bun as well as node.

* fix bun:run script

* make workaround for bug in pulsar-flex. Issue submitted: ayeo-flex-org/pulsar-flex#90

.github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Run Jest Tests
+name: Run Jest Tests on Node.js
 
 on:
   push:

.github/workflows/test_bun.yml

@@ -0,0 +1,42 @@
+name: Run Jest Tests on Bun.js
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test-bun:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Apache Pulsar
+        uses: reugn/github-action-pulsar@v1
+
+      - name: Install Bun
+        run: |
+          curl https://bun.sh/install | bash
+          echo "$HOME/.bun/bin" >> $GITHUB_PATH
+
+      - name: Verify Bun Installation
+        run: bun --version
+
+      - name: Install dependencies with Bun
+        run: bun install
+
+      - name: Run Bun tests
+        run: bun run test:bun
+
+      - name: Upload Bun test logs on failure
+        if: failure()
+        uses: actions/upload-artifact@v3
+        with:
+          name: bun-test-logs
+          path: ./bun-test-logs/*
+