Feature request

phpstan/phpstan-src#1295 added PHPDoc @readonly, but like Psalm it would be useful allow changes in the private scope.

I propose to add a function with the same specifications as @psalm-allow-private-mutation and @psalm-readonly-allow-private-mutation implemented in Psalm.

refs phpstan/phpstan-src#1295, #7774, phpstan/phpstan-src#1609

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