Fedora / EPEL packaging for fsspec-xrootd

[lobis]

I’d like to package fsspec-xrootd for Fedora / EPEL.

The main motivation is downstream packaging: gfal (https://github.com/lobis/gfal) depends on fsspec-xrootd for root:// support, and having fsspec-xrootd available in EPEL would let us depend on it properly instead of bundling it or pulling it from PyPI during RPM builds.

This seems like a good fit now, especially for EPEL 10, since the main dependencies are already there:

python3-fsspec
python3-xrootd

[amadio]

I think it might be easier to coordinate this with @ellert, who already maintains several packages not only in EPEL, but also Debian/Ubuntu, including XRootD and gfal2.