Draft: First version of system-dependent propagators
Description
Move propagator-dependent data out of the systems in the multisystem framework and introduce propagators that depend on the system to hold that data. This will make it easier to handle restarting in the multisystem framework.
News snippet
Create system-dependent propagators
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.