Feature request

There is readonly native class modifier. However it seems unsupported as phpdoc above class.

repro: https://phpstan.org/r/874645f0-1413-4f4c-a5ec-ab69a5958127

The repro shows @immutable phpdoc tag above works, but @readonly does not.

I belive @readonly should be supported exactly the same as @immutable.

If, for some reasons, this is not wanted because of having two phpdoc tags for the same purpose, phpstan should emit an error when @readonly above class is used, otherwise user can very easy be misleaded beliving phpstan is monitoring the class for readonly usage.

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