Add plugin param to only generate gRPC types

[tatemz]

Changes

This change adds the grpcOnly parameter to the plugin in order to handle the cases where the user wants to exclusively generate the types for the grpc service only.

Prior to this change, users could not use grpc-tools, grpc-web, and ts-protoc-gen simultaneously.

After this change, it is possible to let grpc-web generate the .d.ts files (using the commonjs+dts or typescript options) for the non-gRPC generated files, while letting ts-protoc-gen singularly manage the generation of the .d.ts files for grpc-node

Verification

Tested it with the following buf.gen.yml configuration:

version: v1

plugins:
  - name: js
    out: ./__generated/proto/js
    opt:
      - import_style=commonjs,binary

  - name: grpc-node
    path: ./node_modules/.bin/grpc_tools_node_protoc_plugin
    out: ./__generated/proto/js

  - name: grpc-web
    path: ./node_modules/.bin/protoc-gen-grpc-web
    out: ./__generated/proto/js
    opt:
      - import_style=commonjs+dts
      - mode=grpcweb

  - name: ts-node
    path: ~/Development/ts-protoc-gen/bin/protoc-gen-ts
    out: ./__generated/proto/js
    opt:
      - service=grpc-node
      - grpcOnly=true

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[tatemz]

Dev Note: This feature may not be needed by most, but I found that it is helpful when wanting to generate for grpc-node and grpc-web simultaneously. Feel free to suggest any alternative methods for accomplishing this.

I was hoping that grpc-tools allowed for the commonjs+dts option, but it does not, and the proto-loader is not a protoc plugin - https://github.com/grpc/proposal/pull/183#discussion_r453237722

[tatemz]

/assign @marcuslongmuir

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