Add test for MetaSWAP that runs a model

[JoerivanEngelen]

Previously, we had tests that run coupled simulations with MetaSWAP, these are now migrated to primod.
However, this has the disadvantage that we cannot test if changes in our codebase affect coupled simulations.
This is essential for the work coming to us.

Refinement

To start off and get familiar:

• Create script which runs coupled simulation, using copies of the fixtures in primod

In the end, we need something like:

• Make feature branch
• Copy fixtures with coupled simulations from primod into imod-python again
• Copy CI pipeline steps to fetch MetaSWAP executables and iMOD Coupler executable. Alternatively, install iMOD Coupler in development install and run it with its CLI.
• Add primod as dependency to the development install
• Import MetaMod from primod in our test bench
• Copy tests from primod
• Modify tests where necessary
• To debug, this requires turning off the "Just my code" setting.