/BUILD and /protobuf.bzl have unnecessarily hard dependencies on rules_python

[jmillikin-stripe]

The files /BUILD and /protobuf.bzl both load from @rules_python at the top level, which defeats Bazel's lazy fetching of dependencies. This forces projects that depend on Protobuf, but not Python, to need the @rules_python dependency declared.

For /BUILD, I recommend moving the py_library targets into a new file python/BUILD and setting up aliases at the old locations. See PR #7190 for a similar change applied to the Java targets.

For /protobuf.bzl, the py_proto_library() symbol should be moved into an equivalent file under python/. Doing this as a breaking change would be easiest since py_proto_library() is unfortunately a macro, but it may also be possible to replace it with a rule and thereby maintain the existing API.

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