Basic setup to build gRPC Python with Bazel

Building gRPC Python with Bazel has been one of the long requested
additions to gRPC (#8079). Doing so had been made complex by the fact
that Bazel itself is still in active development.

There has been extensive work on building Cython code at tensorflow,
which can be reused for gRPC's purposes as well.

Major included changes required for building grpcio with Bazel are:
- Include Cython as a third party Bazel package, to compile the Cython
parts of gRPC Python.
- Include rules for Python autoconfiguration so Python headers can be
detected by cygrpc.

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