Uvx

Fix

* Rollback some of the speedup (it was a bit too async and stuff broke)

Features

* speed up `uvx list` (+ `uvx check`) with Futures and filtering before running checks (instead of after)
* speed up `upgrade-all`, `reinstall-all`, `upgrade-all` and allow filtering venv names

Feature

* `uvx check` to perform checks (like uvx list does) and report any problems.

Refactoring

* improved Rust-esque codestyle (according to Clippy)

Fix

* `uvx upgrade` stored version metadata wrong

Fix

* `uvx list` was slow due to incorrect SSL behavior.

Features

* Added the `self` subcommand namespace
* `uvx self update` to self-update
* `uvx self changelog` to see the changelog of uvx
* Look for available updates on `uvx list`
* Includes `--skip-updates`, `--show-prereleases`, `--ignore-constraints` as options

BREAKING CHANGE

* `uvx self-update` is now `uvx self update`