[Feature]: Checkpointing-functionality similar to lettuce 0.2.3 in current master branch?

[MaxBille]

Contact Details

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Is your proposal related to a problem?

The current master branch does not contain a checkpointing-functionality. lettuce 0.2.3 did.
There are several use cases for checkpoints (drive storage of populations (and time/step value) for a state):

• limited runtime on HPC cluster: save state before time limit on cluster for a single job is reached and reload checkpoint in a new job for seamless continuation of simulation
• running multiple simulations from an identical starting point that was created in a prior single simulation
• save state at the end of a simulation to (potentially) continue/elongate later, if necessary

Describe the solution you'd like

implement checkpointing-utility

Describe alternatives you've considered

An alternative would be for each user to implement a checkpointing-utility themselves...

Additional context

This is additional context.