## Summary
This also adds filtering for the ARM Pythons, since that needs some libc
changes; and it closes https://github.com/astral-sh/uv/issues/3854 by
way of adding an "arm" branch.
Moves all of `uv-toolchain` into `uv-interpreter`. We may split these
out in the future, but the refactoring I want to do for interpreter
discovery is easier if I don't have to deal with entanglement. Includes
some restructuring of `uv-interpreter`.
Part of #2386
Charlie Marsh