Add uv- prefix to all internal crates (#7853)

## Summary

Brings more consistency to the repo and ensures that all crates
automatically show up in `--verbose` logging.

crates/uv-resolver/src/python_requirement.rs

@@ -1,5 +1,5 @@
-use pep440_rs::Version;
-use pep508_rs::MarkerTree;
+use uv_pep440::Version;
+use uv_pep508::MarkerTree;
 use uv_python::{Interpreter, PythonVersion};
 
 use crate::{RequiresPython, RequiresPythonRange};