Update `sim.config_dict` when saving a `Simulation` to a file

A `Simulation` is usually created from a `config_dict`, which is saved under `sim.config_dict`.
However, when properties of a `Simulation` are changed within the code, e.g.
```julia
sim.detector = SolidStateDetector(sim.detector, ADLChargeDriftModel())
sim.detector = SolidStateDetector(sim.detector, BoggsChargeTrappingModel())
sim.detector = SolidStateDetector(sim.detector, contact_id = 1, contact_potential = 4000u"V")
sim.detector = SolidStateDetector(sim.detector, ConstantImpurityDensity(-1e15))
```
this is not updated in the `sim.config_dict`.

This is, in general, not a big issue. However, when saving a `Simulation` to an LH5 file and reading it back in, the `SolidStateDetector` will be constructed from the `sim.config_dict` and will have forgotten about the settings set interactively.

How I envision this:
When saving, we could add a check which constructs a new `Simulation` from the current `sim.config_dict`.
It, then, compares all initial fields of the new `Simulation` (excluding e.g. `electric_potential`, `electric_field`, `weighting_potentials`, ... which may or may not have been calculated) to the existing ones. If there is a mismatch, it should update the `sim.config_dict` accordingly, before saving it to a file.

Up for discussion would be whether such a `config_dict` up-to-date test should be optional or not.
And if so, whether it should be on by default or not.