Set prettier trailingComma: 'all' to reduce merge conflicts

[devinrhode2]

I'm curious if the maintainers would like to set trailingComma: 'all' in prettier.config.js

I searched discord and github for trailingComma and didn't find much.
History:

• Format codebase with prettier defaults: chore: Format with Prettier defaults #2084
• Run prettier on project: chore: run prettier on project #332 - suggests some preference for avoiding trailing commas.

I like this setting because it reduces merge conflicts. Read more here:
https://prettier.io/blog/2020/03/21/2.0.0.html#change-default-value-for-trailingcomma-to-es5-6963httpsgithubcomprettierprettierpull6963-by-fiskerhttpsgithubcomfisker

I'd be happy to champion the change, having done this at most of my past jobs (Including adding change to a new .gitblameignore file)

[devinrhode2]

trailingCommas: 'all' might also become the default in the future "once the JS ecosystem matures"

[devinrhode2]

Original heated prettier discussion: prettier/prettier#68