Standardize/enforce code formatting on the project

Prescribed Solution:

Format all of the extension code
- Python (using black)
- js, jsx, ts, tsx, json, css, less, sass (using prettier)
~~Format on commit~~
Format on save (user settings, opt in using)
- Use prettier extension
- Use python extension with black
Recommend prettier extension in .vscode/extensions.json
- Use prettier extension
- Use python extension with black
Prettier Config settings
- Prettier rc config (editor agnostic, also picked by CI)
- ~~.vscode/settings~~
CI check for all pipelines (black & prettier)
- PR pipeline
- CI Pipeline
Update contributing guide
Configure prettier to use tslint (ensure this works on CI)
- TIP - Look for prettier plugins (plenty good ones)

Details

~Set up [pre-commit](https://pre-commit.com/) and some [hooks](https://pre-commit.com/hooks.html) for anything which runs quickly:~

~~.. etc.~~