Allow dash to be set in bands plots.

[pfebrer]

This commit also makes line dash work for the matplotlib backend

One can now use the"dash" key in bands_style, as in all other line style specifications in the viz module:

sisl.get_sile("file.bands").plot(bands_style={"dash": "dot"})

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 66.25%. Comparing base (2b299e3) to head (1c5596d).

Files	Patch %	Lines
src/sisl/viz/figure/matplotlib.py	0.00%	4 Missing ⚠️
src/sisl/viz/processors/bands.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #780       +/-   ##
===========================================
- Coverage   87.36%   66.25%   -21.11%     
===========================================
  Files         396      396               
  Lines       50706    50609       -97     
===========================================
- Hits        44298    33530    -10768     
- Misses       6408    17079    +10671     

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[zerothi]

@pfebrer this one fails CI, bands.py: L132, KeyError.

[pfebrer]

Can you add "dash": "solid" to the default styles here?

sisl/src/sisl/viz/processors/bands.py

Line 101 in 58f4758

default_styles = {"color": "black", "width": 1, "opacity": 1}

I forgot, that should solve it.

[zerothi]

done!