feat: merge prettier plugins with options

[suppayami]

Description

Merges plugins list for prettier, allows adding more prettier plugins via prettierOptions

Example

antfu({
  formatters: {
    astro: true,
    prettierOptions: {
      plugins: ['prettier-plugin-tailwindcss'],
    },
  },
})

Linked Issues

Closes #613

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[pauliesnug]

Is this incompatible with #592 ?

[suppayami]

Is this incompatible with #592 ?

The PRs solve different problems I guess. This one allows the prettier plugins list being extended for supported files in formatters, while #592 allows user configuring more kinds of files in formatters