Add clean log level

[vladshcherbin]

Is your feature request related to a problem? Please describe.
It would be great to have an option for a clean logger method, without any labels out of the box. It is useful when you want clean message (for code frame for example) but don't want to use console.log.

Describe the solution you'd like
Something like this (method name can be changed to a preferred one):

const file = await readFile(e.loc.file || e.id, 'utf8')
signale.clean(codeFrameColumns(file, { start: e.loc }, { highlightCode: true }))

[klaudiosinani]

Thank you for taking the time to suggest it : )

[vladshcherbin]

@klauscfhq awesome, thank you! 🎉