apache-pulsar 4.0.0

[cho-m]

Trying this again.

Partly split from #198490 but dependencies probably aren't needed.

[cho-m]

Was trying to build a copy of https://github.com/grpc/grpc-java/tree/master/compiler and hack it into the build system for ARM.

So far not successful and hitting build failure:

A problem occurred configuring project ':grpc-gae-interop-testing-jdk8'.
> Could not create task ':grpc-gae-interop-testing-jdk8:animalsnifferMain'.
   > Could not create task of type 'AnimalSniffer'.
      > Could not generate a decorated class for type AnimalSniffer.
         > org/gradle/api/reporting/internal/TaskReportContainer

[cho-m]

May try to fix ARM in follow up.

Need to first get a PR merged into protobuf to fix build on protoc-gen-grpc-java.

Problem afterward is hacking up Maven build to use system protoc. Right now, it is set up to fetch a pre-built copy of both protobuf and protoc-gen-grpc-java. Would probably need to patch the pom.xml files to avoid the artifacts https://github.com/apache/pulsar/blob/v4.0.0/pulsar-client/pom.xml#L265-L268:

          <protocArtifact>com.google.protobuf:protoc:${protoc3.version}:exe:${os.detected.classifier}</protocArtifact>
          <checkStaleness>true</checkStaleness>
          <pluginId>grpc-java</pluginId>
          <pluginArtifact>io.grpc:protoc-gen-grpc-java:${protoc-gen-grpc-java.version}:exe:${os.detected.classifier}

Or maybe manually run protoc depending on how checkStaleness works

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