working delta-sph and fix usage of "h_factor"

[JonasErbesdobler]

-implementation of delta-SPH for the current main branch
-kernel.h_factor can now be utilized

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 47.25275% with 48 lines in your changes missing coverage. Please review.

Project coverage is 65.6%. Comparing base (0561f51) to head (324199b).

Files	Patch %	Lines
jax_sph/solver.py	45.9%	47 Missing ⚠️
jax_sph/case_setup.py	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #19     +/-   ##
=======================================
- Coverage   66.4%   65.6%   -0.9%     
=======================================
  Files         11      11             
  Lines       1353    1420     +67     
=======================================
+ Hits         899     932     +33     
- Misses       454     488     +34     

Flag	Coverage Δ
unittests	65.6% <47.2%> (-0.9%)	⬇️

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[arturtoshev]

Looking good!