support for class-string-map<T of Foo>

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Start by reviewing issue #246, PHPStan issue #9521, and the linked phpDocumentor TypeResolver issue to understand the proposed class-string-map syntax. Then examine how GenericType represents bounds and how the parser handles this syntax; done means an agreed representation and parser support that avoids a crash.

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描述

I was investigating the option to add support for class-string-map<T of Foo> and found #246, and also https://github.com/phpstan/phpstan/issues/9521. According to @ondrejmirtes in #246 this syntax should already be supported by this library. But is it not.

I'm wondering if we should introduce the syntax, and how this would look like. I can help with the implementation in the parser. But not without an agreement on how this would work on the GenericType.

I would suggest to add a $bound type on the GenericType which is equal to the behavior on @template

This is needed to the mentioned change in phpstan and https://github.com/phpDocumentor/TypeResolver/issues/266. Support in the parser would at least prevent a crash in the parser.

Thanks for this library! 🎉

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