chore: add prettier as formatter

[marcalexiei]

Part of #141

• prettier has been added as formatter and all relevant code has formatted.
• build-and-test.yml workflow has been renamed to CI because now it also includes format check

[elycruz]

@marcalexiei Changes reviewed - don't worry about my comment on updating prettier config to favor single quotes - if you have the time to do soon you can, otherwise I'll merge your changes after you address my other comments and then we can update the prettier config at a later time.

[marcalexiei]

All review comments should have been addressed

[elycruz]

Changes are good. Merging.

[elycruz]

@marcalexiei Hey, your changes are good (thanks for them), though note: coverage went down for insertStyle function - maybe you can add coverage for it in your next PR (it appears the early return statement isn't covered (https://coveralls.io/builds/70199789)).

[marcalexiei]

though note: coverage went down for insertStyle function - maybe you can add coverage for it in your next PR (it appears the early return statement isn't covered

The PR is not merged so I assume is better that I fix the coverage issue here...
Regarding CI permission please check #164 (comment) (on the triage permission)

[elycruz]

No, it's ok - You can do it in your next PR