Commits on Nov 5, 2020

1. Add Prost/Tonic rules …

   This is still very WIP in terms of its integration with rules_rust,
   however, I wanted to put this up as a reference for those who may be
   interested in pushing it forward more.  Ideally, rules_rust would be
   updated to expose an interface similar to rules_go:
   
   https://github.com/bazelbuild/rules_go#protobuf-and-grpc
   
   That allows plugins appropriate access into build internals so that the
   generate code can be shifted by the user.  This quite necessary for
   rust, as there is no canonical rust api for protobuf/grpc;  Prost/Tonic
   is just one of them.
   
   The current rust_proto_library and rust_grpc_library are tied to
   grpc_rust and rust_protobuf crates currently, and this cannot be shifted
   with the rust_protobuf_toolchain.
   
   This PR contains a couple parts:
   
    1. Bazel rules and macros that define an external prost_library and
       tonic_library that can generate code from a proto_library target
    2. A prostgen executable that does the heavy lifting of running the
       code generation, and making sure that different prost_library
       targets can be used in different targets
    3. The cargo file with the requisite crates for prostgen
    4. A set of test cases that we had run into when using prost_library
       and tonic_library.
   
   The //proto/prostgen/raze folder doesn't quite interoperate with the
   //proto/raze folder, and I haven't had a chance to nail that down yet.
   There are also some targets missing from WORKSPACE needed for the tests.
   
   For googlers, the high-level approach is described in go/rust-protobuf.

   David Freese committed Nov 5, 2020
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