Resolve "Couple the TransportSimulation with RichardsSimulation"

What does this MR do?

Couple TransportSimulation with RichardsSimulation

• Share adapters between models.
• Share states with other models (for adaptivity).
• Implement synchronization of steps algorithm.
• Manage different output policies.
• Manage different adaptivity policies.
• Check infinite loop due to dt in time controller.
• Check name clash of output names and paths.
• Check error in conforming fluxes test.
• Cache flux reconstruction.
• Add tracer messages in the coupling.
• Add default files created by dorie create.
• Add linear solver parameters in inifile.
• Ensure const-correctness while allowing parameter modifications https://ts-gitlab.iup.uni-heidelberg.de/dorie/dorie/merge_requests/96#note_20940
• Document courant number
• Remove dummy-transport-simulation-test
• Output total solute
• Add outflow boundary conditions
• Implement outflow in the local operator for finite volumes
• Check why diffusion coefficent does not affect the solution as expected

Is there something that needs to be double checked?

No.

Can this MR be accepted?

• Implemented
• Added test
• Documented (Doxygen)
• Documented (Sphinx)
• Pipeline passing
• Added entry to CHANGELOG.md

Related issues

Closes #101 (closed), #72 (closed)