Use grpc-bom and make protoc-gen-grpc-java.version match grpc.version to fix grpc version incompatibility

[lhotari]

• CI fails currently because of grpc version incompatibilities

Another PR job failed with this kind of exception:

13:11:31.285 [main] ERROR org.apache.bookkeeper.common.component.AbstractLifecycleComponent - Failed to start Component: storage-service
java.lang.NoSuchMethodError: io.grpc.internal.DnsNameResolverProvider.newNameResolver(Ljava/net/URI;Lio/grpc/Attributes;)Lio/grpc/internal/DnsNameResolver;
	at org.apache.bookkeeper.common.resolver.ServiceNameResolverProvider.newNameResolver(ServiceNameResolverProvider.java:95) ~[org.apache.bookkeeper-stream-storage-java-client-4.10.0.jar:4.10.0]
	at org.apache.bookkeeper.common.resolver.NameResolverProviderFactory.newNameResolver(NameResolverProviderFactory.java:45) ~[org.apache.bookkeeper-stream-storage-java-client-4.10.0.jar:4.10.0]
	at io.grpc.NameResolver$Factory.newNameResolver(NameResolver.java:207) ~[io.grpc-grpc-api-1.31.0.jar:1.31.0]
	at io.grpc.NameResolver$Factory.newNameResolver(NameResolver.java:235) ~[io.grpc-grpc-api-1.31.0.jar:1.31.0]
	at io.grpc.internal.ManagedChannelImpl.getNameResolver(ManagedChannelImpl.java:701) ~[io.grpc-grpc-core-1.31.0.jar:1.31.0]
	at io.grpc.internal.ManagedChannelImpl.<init>(ManagedChannelImpl.java:606) ~[io.grpc-grpc-core-1.31.0.jar:1.31.0]

in https://github.com/apache/pulsar/runs/1297863577?check_suite_focus=true

I'd assume that protoc-gen-grpc-java.version should match grpc.version . I also added a change in the PR to use the grpc-bom in dependencyManagement.

[lhotari]

@pkumar-singh and @merlimat , please review these changes since they are related to the recent change #8351 . Thank you

[lhotari]

I found this issue grpc/grpc-java#5556 and I would assume that upgrading protoc-gen-grpc-java.version fixes the problem. I just wonder why the checks passed in #8351 and this issue didn't show up earlier.

[lhotari]

There's a bug in the Github flow. It considers a pom.xml change a documentation only change. I filed #8362.

[lhotari]

There seems to be some remaining issues, I cherry picked this to another PR and it still fails. Perhaps it's better to revert the grpc upgrade until the issue is completely resolved.

[lhotari]

I'm running an experiment in #8358 to see if reverting 647d3c2 fixes the issues.

[lhotari]

I opened #8363 to revert the grpc upgrade since master branch is currently broken. I'll close this PR because of that.