adding a dataloader for residual collocation points and patching some…

[chamel3]

… poisson examples.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.41%. Comparing base (d2ff34a) to head (aa8ac0f).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pancax/domains/collocation_domain.py	31.25%	22 Missing ⚠️
pancax/post_processor.py	73.33%	4 Missing ⚠️
pancax/loss_functions/base_loss_function.py	0.00%	3 Missing ⚠️
pancax/networks/parameters.py	57.14%	3 Missing ⚠️
pancax/networks/fields.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   69.77%   69.41%   -0.37%     
==========================================
  Files          92       92              
  Lines        4209     4260      +51     
==========================================
+ Hits         2937     2957      +20     
- Misses       1272     1303      +31     

Flag	Coverage Δ
unittests	69.41% <50.00%> (-0.37%)	⬇️

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