remove dependencies on component model data strucutres

[LenkaNovak]

• to make our code more modular and general we need to remove the remaining dependencies on component model data structures (e.g., integrator.p.) in the src/ code (especially in ConservationChecker, where we need to add more general unit tests). viz_explorer.jl should be generalized as well.

Components

• write wrapper function for instances where we call integrator.p. and move them to the component/init... files. The wrappers should live in the source code
  • e.g. generalize definitions of get_slab_energy
• revamp all relevant unit tests

QA

• physical and conservation tests should be unchanged
• no significant difference in performance

[juliasloan25]

this has been completed via #436