Adding widget to control aspect ratio of plot

[AndresOrtegaGuerrero]

As requested by Carlo, this PR we add widget to change the width of the plots of the bandspdosplot widget.

For instance , in a 1D GNR the original

can be modified to

The same applied for the bands+pdos plot

The user can do modifcations to obtain

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 6 lines in your changes missing coverage. Please review.

Project coverage is 71.21%. Comparing base (8df45a1) to head (0d1f7d5).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aiidalab_qe/common/bands_pdos/model.py	55.55%	4 Missing ⚠️
...rc/aiidalab_qe/common/bands_pdos/bandpdoswidget.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1098   +/-   ##
=======================================
  Coverage   71.21%   71.21%           
=======================================
  Files         114      114           
  Lines        7107     7128   +21     
=======================================
+ Hits         5061     5076   +15     
- Misses       2046     2052    +6     

Flag	Coverage Δ
python-3.11	71.19% <71.42%> (-0.02%)	⬇️
python-3.9	71.21% <71.42%> (+<0.01%)	⬆️

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[edan-bainglass]

Looks good!