Use hash instead of full wheel name in wheels bucket

[nkitsaini]

Summary

Closes #2410

This changes the name of files in wheels bucket to use a hash instead of the wheel name as to not exceed maximum file length limit on various systems.

This only addresses the primary concern of #2410. It still does not address:

• Path limit of 260 on windows: Too long cache filenames #2410 (comment)
  To solve this we need to opt-in to longer path limits on windows (ref), but I think that is a separate issue and should be a separate MR.
• Exceeding filename limit while building a wheel from source distribution
  As per my understanding, this is out of uv's control. Name of the output wheel will be decided by build-backend used by the project. For wheels built from source distribution, pip also uses the wheel names in cache. So I have not touched sdists cache.

I have added a filename: WheelFileName field in Archive, so we can use it while indexing instead of relying on the filename on disk. Another way to do this was to read .dist-info/WHEEL and .dist-info/METADATA and build WheelFileName but that seems less robust and will be slower.

Test Plan

Tested by installing yt-dlp, httpie and sqlalchemy and verifying that cache files in wheels bucket use hash.

[nkitsaini]

This is an unrelated change. I got a bit confused here between directory/files while reading the code. I can move this to separate MR or remove it if required.

[charliermarsh]

Thanks! Will review.

[charliermarsh]

I think this generally looks right, though I'm undecided on whether we should always do this, or only do it for wheels with filenames that exceed a certain length. It does hurt cache (plaintext) readability a bit which is inconvenient for debugging, since you can no longer infer the wheel tags etc. from the cached filename alone.

[charliermarsh]

At least the hashes are consistent across these files, so you can look at WHEEL:

That's probably good enough.

[nkitsaini]

so you can look at WHEEL:

I was doing a more hacky cat <file> and finding the tags/version.

Let me change the filenames to {trimmed_filename}-{hash}. Should be quick.