feat: QD rate and state friction coupled with Mechanics and Poromechanics solvers.

[CusiniM]

In this PR:

• Refactoring of QD solvers
  • introduced a base class for implicit and explicit integrators
  • introduced dedicated variables for shear and normal tractions and for background stresses.
  • added coupling with any geos solver (provided that it knows how to compute tractions)
• Introduced a OneWayCoupled solver to solve for flow in the fracture and mechanics around it separately. It could probably be done through a Poromechanics solver but I don't think we really want this option to persist. It is just needed to run one of the SCEC benchmarks.
• Add SCEC-BP6 benchmark input files.

[matteofrigo5]

Add brief descriptions for the functions that are missing in the Doxygen documentation

[codecov]

Codecov Report

Attention: Patch coverage is 1.22200% with 485 lines in your changes missing coverage. Please review.

Project coverage is 56.79%. Comparing base (17053bb) to head (1355f13).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...csSolvers/inducedSeismicity/QDRateAndStateBase.cpp	0.00%	120 Missing ⚠️
...Seismicity/kernels/ImplicitRateAndStateKernels.hpp	0.00%	78 Missing ⚠️
...lvers/inducedSeismicity/ImplicitQDRateAndState.cpp	0.00%	61 Missing ⚠️
.../physicsSolvers/inducedSeismicity/SpringSlider.cpp	0.00%	53 Missing ⚠️
...lvers/inducedSeismicity/QuasiDynamicEarthQuake.cpp	0.00%	40 Missing ⚠️
...ucedSeismicity/kernels/RateAndStateKernelsBase.hpp	0.00%	39 Missing ⚠️
...lvers/inducedSeismicity/ExplicitQDRateAndState.cpp	0.00%	27 Missing ⚠️
...sics/OneWayCoupledFractureFlowContactMechanics.cpp	0.00%	19 Missing ⚠️
...Seismicity/kernels/ExplicitRateAndStateKernels.hpp	0.00%	15 Missing ⚠️
...nents/physicsSolvers/contact/ContactSolverBase.cpp	0.00%	8 Missing ⚠️
... and 8 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3416      +/-   ##
===========================================
- Coverage    56.85%   56.79%   -0.07%     
===========================================
  Files         1158     1168      +10     
  Lines       101273   101395     +122     
===========================================
+ Hits         57582    57586       +4     
- Misses       43691    43809     +118     

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