WIP update deps & code to @grpc/grpc-js

[Quezion]

• Tried changing grpc -> @grpc/grpc-js. First commit in PR is using older versions of the library
• Old grpc will not compile https://github.com/grpc/grpc-node/issues/1880
• Current 'npm run build' hits TypeScript error in conversation.ts

I tried bumping @grpc library versions but it doesn't change the error. I'm not familiar with TypeScript & didn't recognize how to resolve this error... but maybe it's obvious to a TS dev?

$ npm run build

> [email protected] build
> rm -rf lib && rollup -c rollup.config.ts


src/assistant.ts → lib/assistant.js, lib/assistant.mjs...
created lib/assistant.js, lib/assistant.mjs in 576ms

src/audio-conversation.ts → lib/audio-conversation.js, lib/audio-conversation.mjs...
created lib/audio-conversation.js, lib/audio-conversation.mjs in 353ms

src/common.ts → lib/common.js, lib/common.mjs...
created lib/common.js, lib/common.mjs in 317ms

src/conversation.ts → lib/conversation.js, lib/conversation.mjs...
[!] (plugin rpt2) Error: /Users/qyarbrough/repos/dabolus/nodejs-assistant/src/conversation.ts(59,24): semantic error TS2769: No overload matches this call.
  Overload 1 of 3, '(chunk: AssistRequest, cb?: Function): void', gave the following error.
    Argument of type '(err: Error) => void' is not assignable to parameter of type 'AssistRequest'.
      Property 'audioIn' is missing in type '(err: Error) => void' but required in type '{ audioIn: Buffer; config?: never; }'.
  Overload 2 of 3, '(chunk: AssistRequest, encoding?: any, cb?: Function): void', gave the following error.
    Argument of type '(err: Error) => void' is not assignable to parameter of type 'AssistRequest'.
      Type '(err: Error) => void' is not assignable to type '{ audioIn: Buffer; config?: never; }'.
src/conversation.ts

This is the codeblock that the compiler is error'ing on (~line 59):

  public end(): Promise<void> {
    return new Promise((resolve, reject) => {
      this._stream.end((err: Error) => {
        if (err) {
          reject(err);
        } else {
          resolve();
        }
      });
    });
  }

Related to #30, may fix or get one step closer to running on Mac M1

I found a similar PR that upgrades to @grpc at https://github.com/stephenh/ts-proto/pull/401 -- but looks like they didn't run into TS errors on upgrade.