add support for @vitest/eslint-plugin

[donalmurtagh]

eslint-plugin-vitest has formatting rules that are not disabled by eslint-config-prettier. All the rules matching padding-around-.* are formatting rules

[tho-dan]

I don't even see eslint-config-prettier in the package.json, leading to constantly having conflicts between the two locally (which is rather annoying).
Am I missing something? Or should we look at code style and linting in general for this?