Bandswidget refactoring

[AndresOrtegaGuerrero]

In this PR, I am refactoring the BandsPdosWidget in order to only create the plot once , and apply updates using the helper in the model avoiding reploting.
There is also the inclusion of a widget to change the color of the traces

[codecov]

Codecov Report

Attention: Patch coverage is 47.87234% with 49 lines in your changes missing coverage. Please review.

Project coverage is 68.00%. Comparing base (2fd8c91) to head (d91bb8c).

Files with missing lines	Patch %	Lines
src/aiidalab_qe/common/bands_pdos/model.py	36.84%	24 Missing ⚠️
src/aiidalab_qe/common/bands_pdos/utils.py	17.64%	14 Missing ⚠️
...rc/aiidalab_qe/common/bands_pdos/bandpdoswidget.py	57.14%	9 Missing ⚠️
...rc/aiidalab_qe/common/bands_pdos/bandpdosplotly.py	88.88%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #941      +/-   ##
==========================================
- Coverage   68.40%   68.00%   -0.41%     
==========================================
  Files         110      110              
  Lines        6096     6129      +33     
==========================================
- Hits         4170     4168       -2     
- Misses       1926     1961      +35     

Flag	Coverage Δ
python-3.11	67.98% <47.87%> (-0.42%)	⬇️
python-3.9	68.02% <47.87%> (-0.41%)	⬇️

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[AndresOrtegaGuerrero]