Introduce arrow-body-style option to work-around eslint bug

[devinrhode2]

Unsurprisingly, this has been asked about a few times already.

#5195
#4928
#3949
#3425

I believe this is unrelated, but mentions arrow-body-style: #165

Oddly, github.com/prettier/prettier uses both of these problematic eslint rules:
https://github.com/prettier/eslint-plugin-prettier#arrow-body-style-and-prefer-arrow-callback-issue
GH issue link: prettier/eslint-plugin-prettier#65

I think, because of these very long-standing eslint issue, it would be nice if prettier supported some config options equivalent to these two eslint rules:

• https://eslint.org/docs/rules/arrow-body-style
• https://eslint.org/docs/rules/prefer-arrow-callback

Please don't feel bad about just closing this, it's really A-ok :)

[fisker]

This is not possible for us to fix, it should either fix on eslint-plugin-prettier or eslint side.

prettier/eslint-plugin-prettier#379 should fix these issues, but it it will be slower.