use github.com/googleapis/googleapis directly

[qzmfranklin]

I am integrating this repository into my own Bazel project.

I am already using github.com/googleapis/googleapis as the @googleapis repository (the canonical one), which collides with the definition of the @googleapis repository for which a BUILD.googleapis file is vendored in external (the vendored).

I looked through the differences. I noticed that mainly the @googleapis vendored here ships with cc_grpc_library targets on top of a few things that the canonical repo already has.

It would probably be best to consolidate the two. Would like to open the discussion a bit.