`gen_rust_project` does not add `prost` and `tonic` deps to `rust_proto_library`

[hauserx]

Example from examples/proto after running bazel run @rules_rust//tools/rust_analyzer:gen_rust_project. Note that rust-analyzer shows a number of diagnostics, for example in grpc_client/src/main.rs:

The generated rust-project.json has missing deps:

  "crates": [
    {
      "display_name": "proto_bindings",
      "root_module": "(...)/execroot/_main/bazel-out/k8-fastbuild/bin/proto_bindings/proto_bindings.lib.rs",
      "edition": "2021",
      "deps": [],

Adding below dependencies manually fixes the issue:

  "crates": [
    {
      "display_name": "proto_bindings",
      "root_module": "(...)/execroot/_main/bazel-out/k8-fastbuild/bin/proto_bindings/proto_bindings.lib.rs",
      "edition": "2021",
      "deps": [
        {
          "crate": 75,
          "name": "prost"
        },
        {
          "crate": 80,
          "name": "tonic"
        }
      ],