[9.3.0] remote: add gRPC service config support

[bazel-io]

Forked from #29912

[bazel-io]

Cherry-pick was attempted but there were merge conflicts in the following file(s). Please resolve manually.

src/main/java/com/google/devtools/build/lib/remote/BUILD
src/main/java/com/google/devtools/build/lib/remote/GrpcCacheClient.java
src/main/java/com/google/devtools/build/lib/remote/RemoteModule.java
src/main/java/com/google/devtools/build/lib/remote/downloader/GrpcRemoteDownloader.java
src/test/java/com/google/devtools/build/lib/remote/BUILD
src/test/java/com/google/devtools/build/lib/remote/ByteStreamUploaderTest.java
src/test/java/com/google/devtools/build/lib/remote/RemoteModuleTest.java

cc: @bazelbuild/triage

[iancha1992]

Cherry-pick was attempted but there were merge conflicts in the following file(s). Please resolve manually.

src/main/java/com/google/devtools/build/lib/remote/BUILD src/main/java/com/google/devtools/build/lib/remote/GrpcCacheClient.java src/main/java/com/google/devtools/build/lib/remote/RemoteModule.java src/main/java/com/google/devtools/build/lib/remote/downloader/GrpcRemoteDownloader.java src/test/java/com/google/devtools/build/lib/remote/BUILD src/test/java/com/google/devtools/build/lib/remote/ByteStreamUploaderTest.java src/test/java/com/google/devtools/build/lib/remote/RemoteModuleTest.java

cc: @bazelbuild/triage

cc: @sluongng @fmeum

[sluongng]

I will create a PR to cherry pick both #29916 and #29912

question: should they be 1 PR or 2

[sluongng]

@iancha1992 see #30666

and #30667 will be after that one