Wip/some cleanups

[msherman64]

A few cleanups for maintainability:

1. switch from poetry to uv for building, benefit is more maintainable pyproject.toml and lockfile
2. unvendor FATTools and pin the version, in an effort to improve python3 support. in recent python versions it starts to complain about syntax in some of the regexes internal to FATTools
3. drop python-chi and use openstacksdk directly. This tool interacts directly with Doni, and we never used any special python-chi things. Benefit is dropping a large set of unused dependencies, since python-chi depends on basically all python-openstack clients.