Switch from `grpc` to `grpc-js`

[huan]

We are trying to find a pure JavaScript solution for our Wechaty ecosystem so that we can put Wechaty instances into not only the Node.js server but the Browser client.

1. How to generate require('@grpc/grpc-js') instead of require('grpc') grpc/grpc-node#931
2. grpc_tools_node_protoc_ts @grpc/grpc-js support

Useful links

• https://github.com/decred/decrediton/pull/2936
• Feature comparison of grpc and @grpc/grpc-js packages

[huan]

Done.