Move dirichlet bc func to field

[chamel3]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.13%. Comparing base (7d44a99) to head (5f63456).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pancax/post_processor.py	44.23%	29 Missing ⚠️
pancax/physics_kernels/base.py	34.48%	19 Missing ⚠️
pancax/loss_functions/weak_form_loss_functions.py	0.00%	11 Missing ⚠️
pancax/cli/cli.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   70.07%   70.13%   +0.05%     
==========================================
  Files          90       91       +1     
  Lines        4044     4135      +91     
==========================================
+ Hits         2834     2900      +66     
- Misses       1210     1235      +25     

Flag	Coverage Δ
unittests	70.13% <70.00%> (+0.05%)	⬆️

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