Change default Voigt implementation to voigt_faddeeva

[ConorMacBride]

This PR changes the default Voigt implementation from voigt_integrate to voigt_faddeeva because it is much more efficient and sufficiently accurate.

[codecov]

Codecov Report

Merging #52 (4e7dcea) into main (997cd08) will decrease coverage by 0.17%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   95.02%   94.86%   -0.17%     
==========================================
  Files          18       18              
  Lines        1367     1362       -5     
==========================================
- Hits         1299     1292       -7     
- Misses         68       70       +2     

Impacted Files	Coverage Δ
src/mcalf/models/base.py	84.25% <ø> (-0.62%)	⬇️
src/mcalf/models/results.py	100.00% <ø> (ø)
src/mcalf/utils/plot.py	100.00% <ø> (ø)
src/mcalf/utils/smooth.py	100.00% <ø> (ø)
src/mcalf/profiles/voigt.py	95.83% <71.42%> (-0.28%)	⬇️
src/mcalf/models/ibis.py	92.12% <100.00%> (ø)
src/mcalf/visualisation/spec.py	100.00% <100.00%> (ø)

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