chore(cli): add prettier

[DanielMSchmidt]

Prettier helps us have a consistent code style. I'm intentionally using the default configuration as I don't want to bring my own preferred code style in too much.

This PR contains:

• a pre-commit hook that formats staged files (with no user interaction for installing or within commiting)
• a check that turns the tests red if files are not formatted
• a command to run formatting over all files (probably not going to be used much)

While reviewing, please ignore the last two commits, they are applying the new code styles.

Please run

1. git cherry-pick 20be6036dff274aaf808f3584bfa6a53942cb2c8
2. git cherry-pick f7a45182ac0dec6be4c174bc6573e69bd0b10ae5
3. yarn
4. yarn format
5. git pull origin main --rebase

to bring your branch up to date

[github-actions]

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