Add fast xva_bridge.py script

[dinhngtu]

Add a rewritten XVA bridge getter/setter script using libarchive bindings.

This script streams tar members directly instead of using temporary files, and thus processes XVAs faster than the existing shell scripts, without needing additional disk space (beyond that of the new XVA).

It also uses Python's DOM library to guarantee parsing of ova.xml.

Tested on libarchive-c==5.3. Due to use of library internals, may not work on other versions of libarchive-c.

Delete the old bash scripts for XVA editing.

[stormi]

Should the readme mention this requirement? And/or the whole project's python requirements be updated so that everyone can use the script without having to discover the missing dependency at runtime?

[dinhngtu]

I wasn't sure about updating the repo-level requirements since it's not part of the tests, so I'll defer to your preference.

[stormi]

CC @glehmann or @ydirson for opinion. Context: a script which is not directly used by the tests, but is actually a utility we use to generate test XVAs, has a new dependency.

[glehmann]

In my opinion, it should be added to the dev dependencies.
uv add --raw 'libarchive-c==5.3'

[dinhngtu]

Updated deps

[glehmann]

Sorry, I forgot the --dev flag in the command above.

uv remove libarchive-c
uv add --raw 'libarchive-c==5.3' --dev
uv run ./requirements/update_requirements.py

[dinhngtu]

Static binary builder using Nuitka is available here: https://github.com/dinhngtu/xva-bridge-builder

[stormi]

Ping @glehmann for re-review.

[glehmann]

Just moving libarchive-c to the dev dependencies and it's good for me