Support Prettier as a formatter

[rhuanbarreto]

The prettier formatter (https://github.com/prettier/plugin-ruby) is very good and it can be an option for people like me that doesn't have a good relationship with rubocop breaking cops every time due to bad version handling.

Is that possible to support this library?

[github-actions]

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[rhuanbarreto]

Any updates?

[wingrunr21]

Resolved via #690