auto-complete etc support for protobuf generated code

[Shawn Wang]

Hi all,

Do you have any insights into this issue? https://github.com/bazelbuild/intellij/issues/6379

(I filed it under bazelbuild, but now think it's likely more of a py_proto_library issue.)

In particular, this bug mentions

"There is an option `--pyi_out`in protoc 21.5 which does what mypy-protobuf does without installing another dependency"

Is `--pyi_out` possible with py_proto_library?

Thanks!