Add generic type for $c->get method

[renakdup]

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[renakdup]

https://phpstan.org/blog/generics-by-examples#function-accepts-any-string%2C-but-returns-object-of-the-same-type-if-it%E2%80%99s-a-class-string

Generics could not be applied because we use as classes and as string types as well.
So due to that in case of using combining types it would not work, and we get an error

due to type normalizing.
And in case we use just class-string and returning type T it works for classes but doesn't work for string in $c->get('string-service') in case we use primitives