Sunset the @protobuf-ts/protoc package, switch to package protoc

[timostamm]

@protobuf-ts/protoc provides the Protobuf compiler protoc, which is otherwise cumbersome to install in an npm project. Unfortunately, its approach of downloading protoc on the fly has downsides, for example #723 and #507.

To solve this problem, I've set up a replacement: The npm package protoc is a very simple npm distribution of the protoc binary from https://github.com/protocolbuffers/protobuf/releases. For every upstream release, a new npm package version is published.

The package @protobuf-ts/protoc won't vanish from npmjs.com, but it won't see further development. I hope that's understandable, and that the new package is a useful replacement.

To migrate from @protobuf-ts/protoc to protoc:

npm remove @protobuf-ts/protoc
npm install protoc

If you have pinned your protoc version via config.protocVersion in package.json, install the corresponding version of protoc. If you import protobuf-ts.proto, add --proto_path ./node_modules/@protobuf-ts/plugin to your protoc call.