[FEATURE] Support Python and Go protobuf code generation

[karenyrx]

Is your feature request related to a problem?

Currently the repository supports generating code for Java, but should also support other languages - Python and Go at the very least (for consumption by opensearch-py, opensearch-go, and opensearch-benchmark-workloads).

What solution would you like?

Bazel should still be the build system used to compile/generate these protos.

Example resources:

• https://thethoughtfulkoala.com/posts/2020/05/08/py-protobuf-bazel.html
• https://rules-proto-grpc.com/en/latest/lang/go.html

What alternatives have you considered?

Raw protoc commands in bash scripts with Makefile's

Do you have any additional context?

Add any other context or screenshots about the feature request here.

[karenyrx]

@finnegancarroll will help on the Python code generation

[finnegancarroll]

^taking a look at the python client/lib builds!