feat: add acoustic VTI and TTI wave equation solvers

[bd713]

Reworking #2816 and #3008

WIP!

[codecov]

Codecov Report

❌ Patch coverage is 0.33809% with 2653 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.87%. Comparing base (9c556db) to head (4fa96a3).
⚠️ Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
...anisotropic/AcousticVTIFletcherWaveEquationSEM.cpp	0.00%	486 Missing ⚠️
...qn/anisotropic/AcousticVTIZhangWaveEquationSEM.cpp	0.00%	479 Missing ⚠️
...anisotropic/AcousticTTIFletcherWaveEquationSEM.cpp	0.00%	473 Missing ⚠️
...qn/anisotropic/AcousticTTIZhangWaveEquationSEM.cpp	0.00%	470 Missing ⚠️
.../sem/acoustic/shared/AcousticMatricesSEMKernel.hpp	0.00%	236 Missing ⚠️
...rmulations/Qk_Hexahedron_Lagrange_GaussLobatto.hpp	0.00%	78 Missing ⚠️
...ropic/AcousticTTIFletcherWaveEquationSEMKernel.hpp	0.00%	76 Missing ⚠️
...sotropic/AcousticTTIZhangWaveEquationSEMKernel.hpp	0.00%	74 Missing ⚠️
...ropic/AcousticVTIFletcherWaveEquationSEMKernel.hpp	0.00%	67 Missing ⚠️
...sotropic/AcousticVTIZhangWaveEquationSEMKernel.hpp	0.00%	66 Missing ⚠️
... and 9 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3818      +/-   ##
===========================================
- Coverage    59.48%   57.87%   -1.61%     
===========================================
  Files         1288     1301      +13     
  Lines       112000   114001    +2001     
===========================================
- Hits         66618    65981     -637     
- Misses       45382    48020    +2638     

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