Include xas yaml in package data

[superstar54]

Fix bug from #580

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1950c34) 77.55% compared to head (aebdd64) 77.55%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #609   +/-   ##
=======================================
  Coverage   77.55%   77.55%           
=======================================
  Files          54       54           
  Lines        3831     3831           
=======================================
  Hits         2971     2971           
  Misses        860      860           

Flag	Coverage Δ
python-3.10	77.55% <ø> (ø)
python-3.8	77.58% <ø> (ø)
python-3.9	77.58% <ø> (?)

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[unkcpz]

Thanks @superstar54