Use structured types for parsing and formatting language and ABI tags (…

…#10525)

## Summary

I need to be able to do non-lexicographic comparisons between tags
(e.g., so I can sort `cp313` as greater than `cp39`). It ended up being
easiest to just create structured types for all the tags we support,
with `FromStr` and `Display` implementations.

We don't currently store these in `Tags` or in `WheelFilename`. We may
want to, since they're really small (and `Copy`), but I need to
benchmark to determine whether parsing these in `WheelFilename` is
prohibitively slow.

crates/uv-distribution-filename/src/wheel.rs

@@ -177,6 +177,8 @@ impl WheelFilename {
             name,
             version,
             build_tag,
+            // TODO(charlie): Consider storing structured tags here. We need to benchmark to
+            // understand whether it's impactful.
             python_tag: python_tag.split('.').map(String::from).collect(),
             abi_tag: abi_tag.split('.').map(String::from).collect(),
             platform_tag: platform_tag.split('.').map(String::from).collect(),