Add MODULE.bazel to rules proto

[comius]

This supports using rules_proto as a bzlmod dependency.

[comius]

@meteorcloudy interesting, I don't get the error running locally. Is there another workaround for local_cc_config?

ERROR: /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/ec321eb2cc2d0f8f91b676b6d4c66c29/external/bazel_tools/tools/cpp/BUILD:58:19: every rule of type cc_toolchain_alias implicitly depends upon the target '@[unknown repo 'rules_cc.0.0.1.cc_configure.local_config_cc' requested from @]//:toolchain', but this target could not be found because of: no such package '@[unknown repo 'rules_cc.0.0.1.cc_configure.local_config_cc' requested from @]//': The repository '@[unknown repo 'rules_cc.0.0.1.cc_configure.local_config_cc' requested from @]' could not be resolved: Repository '@rules_cc.0.0.1.cc_configure.local_config_cc' is not visible from repository '@'

[meteorcloudy]

Very nice, thanks!!