add global flag support for —silent, —json, —auth

[DavidWells]

This updates command parser to allow any command using this.parse to accept --json, --auth, & --silent flags.

Todo:

• Update this.log to support silent
• Add json support to commands returning data

[DavidWells]

Ref netlify/cli#248

[DavidWells]

Unclear on what version node ...spread args where introduced.

Might need to change the log mechanism for older node

  log(message = '', ...args) {
    if (this.argv && this.argv.includes('--silent')) {
      return
    }
    message = typeof message === 'string' ? message : inspect(message)
    process.stdout.write(format(message, ...args) + '\n')
  }

[DavidWells]

Need to change auth flag here to identity https://github.com/netlify/netlify-dev-plugin/blob/master/src/commands/functions/invoke.js#L248-L253 to avoid collision

[DavidWells]

JSON example

[DavidWells]

There is a chalk api proxy for --json mode

If we don't disable chalk output in JSON gets garbled like:

After the proxy:

Effectively all this.chalk.whatever.hahaha.yolo('message here') calls get noOp and simply return their value without coloring.

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Alternative method https://github.com/chalk/chalk#chalklevel level 0. I tried this and it looks like the version of chalk we use doesn't support.