pretty-config: add support for passing array of names

[tunnckoCore]

Which will behave like that

let settings = await prettyConfig('rollup', { configFiles })

if (!settings) {
  settings = await prettyConfig('rolldown', { configFiles })
}
console.log(settings)

instead of above we can hide it to look like that

const settings = await prettyConfig(['rollup', 'rolldown'], { configFiles })

if (!settings) {
  console.log('no config files found for `rollup` and `rolldown` tools')
}

[auto-comment]

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Hey @tunnckoCore, check out this one too! ;)