Proposal: "mock" backend

[martinmodrak]

Doing full integration tests of calls to brm or brm_multiple is currently hard as it requires compiling and fitting actual models. However the multiple backend feature should let us easily implement a "mock" backend for testing that would skip compilation and fitting but still go through all the other codepaths, e.g.:

• make standata
• generate Stan code
  • optionally check it for correctness
• cache results / load results from cache

This arised due to needs to test #1114

[paul-buerkner]

That is a great idea!