Add Biome assists support

[lkoe]

I want to have biome run assists as well, particularly organize-imports.
This would require to run the check command, instead of format.

Various other formatters (java, kotlin...) support organizing imports via Spotless, so it should be quite natural to have Biome provide similar capabilities.

As discussed in #2275 linting is however not the focus of Spotless, hence should be disabled.