Micro simulation is loaded after initializing preCICE

[fsimonis]

Currently, the micro simulation is loaded after Participant.initialize() is called.

This is annoying when developing a micro simulation, as the macro side needs to be started to see if the micro simulation is even importable.

I suggest one of:

• load the micro simulation(s) before initialize()
• provide an option to only check if provided micro simulations are importable micro-simulation-precice --check config.json
• a standalone lool like check-micro-simuluation that does this for you