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1d4bb15a - [ty] Allow stringified argument in PEP 613 alias to `Optional` (#23200)

[ty] Allow stringified argument in PEP 613 alias to `Optional` (#23200) ## Summary The argument of `Optional[…]` in value position was previously inferred as a value expression, but there is no need for that. We know that the argument is always a type expression. This change allows us to handle stringified arguments correctly. We already do the same for similar special forms like `typing.Union`. closes https://github.com/astral-sh/ty/issues/2770 ## Test Plan Added regression test and some related additional tests.