Add CI, integration test infrastructure, and testcontainer-based tests

.github/workflows/ci.yaml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+name: Pulsar Connectors CI
+
+on:
+  pull_request:
+    branches: ['main', 'master', 'branch-*']
+  push:
+    branches: ['main', 'master', 'branch-*']
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  JDK_DISTRIBUTION: corretto
+  JDK_VERSION: 17
+  GRADLE_OPTS: -Dorg.gradle.daemon=false -Dorg.gradle.parallel=true
+
+jobs:
+  build-and-license:
+    name: Build and License check
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: ${{ env.JDK_DISTRIBUTION }}
+          java-version: ${{ env.JDK_VERSION }}
+      - uses: gradle/actions/setup-gradle@0723195856401067f7a2779048b490ace7a47d7c
+
+      - name: Build all modules
+        run: ./gradlew build -x test
+      - name: License check (RAT)
+        run: ./gradlew rat
+
+  tests:
+    name: Tests - ${{ matrix.name }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    needs: build-and-license
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: Connectors
+            tasks: test
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: ${{ env.JDK_DISTRIBUTION }}
+          java-version: ${{ env.JDK_VERSION }}
+      - uses: gradle/actions/setup-gradle@0723195856401067f7a2779048b490ace7a47d7c
+
+      - name: Run tests
+        run: ./gradlew ${{ matrix.tasks }}
+      - name: Upload test reports
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.name }}-test-reports
+          path: '**/build/reports/tests/'
+          retention-days: 7

LICENSE

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+----------------------------------------------------------------------------------------------------
+
+pulsar-common/src/main/java/org/apache/pulsar/common/util/protobuf/ByteBufCoded{Input,Output}Stream.java
+
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+support library is itself covered by the above license.

NOTICE

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+Apache Pulsar
+Copyright 2017-2024 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).