WIP: Non-Conservative BCs update

[MarcoArtiano]

This PR prepares TrixiShallowWater.jl to the upcoming update in Trixi main Add flexibility to nonconservative BCs.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.

Project coverage is 26.62%. Comparing base (8c22e65) to head (7c5ef54).

Files with missing lines	Patch %	Lines
src/equations/shallow_water_multilayer_2d.jl	0.00%	7 Missing ⚠️
src/equations/shallow_water_wet_dry_2d.jl	0.00%	7 Missing ⚠️
src/equations/shallow_water_multilayer_1d.jl	0.00%	6 Missing ⚠️
src/equations/shallow_water_two_layer_1d.jl	0.00%	6 Missing ⚠️
src/equations/shallow_water_exner_1d.jl	0.00%	4 Missing ⚠️
src/equations/shallow_water_wet_dry_1d.jl	0.00%	4 Missing ⚠️
...dgsem/elixir_shallowwater_three_mound_dam_break.jl	0.00%	3 Missing ⚠️
src/equations/shallow_water_two_layer_2d.jl	0.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (8c22e65) and HEAD (7c5ef54). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (8c22e65)	HEAD (7c5ef54)
	5	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #64       +/-   ##
===========================================
- Coverage   99.27%   26.62%   -72.66%     
===========================================
  Files          60       60               
  Lines        2626     2524      -102     
===========================================
- Hits         2607      672     -1935     
- Misses         19     1852     +1833     

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