Make Prettier and Biome optional peer dependencies

[silvenon]

What do you think of making Prettier and Biome optional dependencies, and conditionally importing whichever one is selected as the formatter? That way people get to install Prettier or Biome version they want, or none.

I've never done this before, but it seems like marking them as optional peer dependencies would be the way to go in that scenario using peerDependenciesMeta. ChatGPT says that npm v7+ supports this, and that only Yarn v1 would print out warnings for unmet peerDependencies, which seems like a small price to pay.