Support for 3d idp mortars on TreeMesh

[bennibolm]

This PR also contains the implementation of subcell 3D from bennibolm#143 and 2D idp mortars from #2305.

[github-actions]

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Created with ❤️ by the Trixi.jl community.

[codecov]

Codecov Report

❌ Patch coverage is 75.25316% with 782 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.36%. Comparing base (329480a) to head (4f49c88).
⚠️ Report is 182 commits behind head on bb/idp-amr.

Files with missing lines	Patch %	Lines
src/solvers/dgsem_tree/dg_3d_subcell_limiters.jl	41.70%	337 Missing ⚠️
src/solvers/dgsem_p4est/dg_3d_subcell_limiters.jl	57.71%	225 Missing ⚠️
...tree_2d_dgsem/elixir_euler_astro_jet_sc_subcell.jl	0.00%	57 Missing ⚠️
src/equations/ideal_glm_mhd_3d.jl	42.42%	57 Missing ⚠️
src/solvers/dgsem_tree/containers_3d.jl	69.08%	47 Missing ⚠️
...em/elixir_euler_sedov_blast_wave_amr_sc_subcell.jl	0.00%	15 Missing ⚠️
src/solvers/dgsem_p4est/subcell_limiters_3d.jl	97.64%	8 Missing ⚠️
src/solvers/dgsem_tree/subcell_limiters_3d.jl	98.27%	6 Missing ⚠️
src/solvers/dgsem_p4est/containers.jl	88.64%	5 Missing ⚠️
...sem/elixir_euler_weak_blast_wave_amr_sc_subcell.jl	77.78%	4 Missing ⚠️
... and 9 more

Additional details and impacted files

@@              Coverage Diff               @@
##           bb/idp-amr    #2626      +/-   ##
==============================================
- Coverage       96.84%   95.36%   -1.47%     
==============================================
  Files             535      550      +15     
  Lines           43211    46335    +3124     
==============================================
+ Hits            41844    44186    +2342     
- Misses           1367     2149     +782     

Flag	Coverage Δ
unittests	95.36% <75.25%> (-1.47%)	⬇️

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[bennibolm]

See bennibolm#145