Add the possibility to start simulation from a particular state (and enable checkpoint/restart)

If Batsim would be able to start from a particular state: keeping the states of jobs:

in queue
running
not submitted yet

We would be able to avoid warmup effect and, more importantly, to have a checkpoint restart of the simulation. It allows Batsim's long simulations to be split in several small run in best effort for example.

Do you think it is doable?

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