use prettier to enforce TS/JS styles

[krancour]

Fixes #1862

This PR sets up prettier for the three TS-based components, similar to how we have already done for the SDK for JS/TS and the Dashboard.

The difference here is that there's separate prettier config for each of the three components in question, because the tool seems to expect that its config and package.json live in the same dir. Event if you use the --config to point it elsewhere for config, it ends up looking for your package.json there also. 🤷‍♂️

The PR is decomposed into separate commits for:

• Setting up prettier for:
  • brigadier
  • brigadier-polyfill
  • worker
• Add a make target to run style checks across all three
• Incorporate checks into CI
• Run yarn style:fix on each of the following, with no manual changes:
  • brigadier
  • brigadier-polyfill
  • worker

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[krancour]

/brig run