[ilovapples]

I hope it's ok for me to pick up this PR; please close this if not. I've been wanting this feature for a while and it doesn't seem like the original author (barrey3406) is planning to work on this anytime soon.

I've rebased and applied techatrix's suggestions from the original code review.
Side note: If it's reasonable to also obtain the address_space from the pointer, I'm not sure how to do it, so any guidance here would be much appreciated.

From the original author's PR comment:

The ptr_type resolver in analysis.zig only read const_token from ptr_info, and Data.createPointer only set is_const on the InternPool.pointer_type flags. So *allowzero u8, *align(4) u8, *volatile u8 and friends all collapsed to *u8 in inlay hints (and anywhere else that runs through stringifyTypeOf).

This reads volatile_token, allowzero_token, and the literal integer in ast.align_node from ptr_info, plumbs them through createPointerType / Data.createPointer into the IP flags and the .pointer Data fallback, and updates rawStringify so the fallback path matches the InternPool printer.

Address-space resolution from arbitrary expressions still defers to .generic; the field is plumbed through but only the literal alignment integer is currently read.

Regression coverage added in tests/lsp_features/inlay_hints.zig.

Fixes #2603."