make pdos a plugin

[superstar54]

Follow PR #456 and PR #458 , this PR makes the pdos as a plugin. It implements:

• UI part. Only the outline and result panel are added.
• Workchain part.

[codecov]

Codecov Report

Patch coverage: 35.29% and project coverage change: -0.50% ⚠️

Comparison is base (c3ef810) 56.69% compared to head (53ad400) 56.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   56.69%   56.19%   -0.50%     
==========================================
  Files          36       39       +3     
  Lines        2593     2657      +64     
==========================================
+ Hits         1470     1493      +23     
- Misses       1123     1164      +41     

Flag	Coverage Δ
python-3.10	56.19% <35.29%> (-0.50%)	⬇️
python-3.8	56.23% <35.29%> (-0.51%)	⬇️
python-3.9	56.23% <35.29%> (-0.51%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/aiidalab_qe/app/configuration/__init__.py	32.63% <ø> (+0.67%)	⬆️
src/aiidalab_qe/workflows/__init__.py	52.98% <0.00%> (+2.98%)	⬆️
src/aiidalab_qe/plugins/pdos/result.py	14.28% <14.28%> (ø)
src/aiidalab_qe/app/submission/__init__.py	70.70% <75.00%> (ø)
src/aiidalab_qe/plugins/pdos/workchain.py	92.85% <92.85%> (ø)
src/aiidalab_qe/app/configuration/workflow.py	100.00% <100.00%> (ø)
src/aiidalab_qe/plugins/pdos/__init__.py	100.00% <100.00%> (ø)
tests/test_entry_point.py	100.00% <100.00%> (ø)

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[unkcpz]

Just one minor request, the refactoring looks very nice! Thanks!

[unkcpz]

I think most of the functions in this file moved from the result.electronic_structure module, but I didn't see the original codes were deleted.

[unkcpz]

As we discussed offline, the original code are required by both pdos and bands plugins. It'll be better to find a better way to put the shared modules of multiple plugins. @superstar54 will take care of it after and open a dedicate issue for it. I approve this PR.