Fix FSI-Open Boundary interaction and add variable material parameters

[LasNikas]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 56.25000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 69.87%. Comparing base (f8ea678) to head (46c98a1).

Files with missing lines	Patch %	Lines
...chemes/solid/total_lagrangian_sph/penalty_force.jl	0.00%	5 Missing ⚠️
src/general/semidiscretization.jl	0.00%	4 Missing ⚠️
src/schemes/solid/total_lagrangian_sph/system.jl	85.00%	3 Missing ⚠️
src/schemes/boundary/open_boundary/system.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
- Coverage   69.98%   69.87%   -0.12%     
==========================================
  Files          96       96              
  Lines        6170     6187      +17     
==========================================
+ Hits         4318     4323       +5     
- Misses       1852     1864      +12     

Flag	Coverage Δ
unit	69.87% <56.25%> (-0.12%)	⬇️

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[LasNikas]

/run-gpu-tests