chore: Refactor Settlement to allow resimulation

[sunce86]

Background

Currently the simulation of settlement is part of the Settlement constructor (encode function). As I tend to agree that successful simulation is needed for a settlement to be valid and exist, we need a way to resimulate settlement because settlement being valid at time X (simulate successfully) is not a guarantee that it will be also valid at time X + y seconds.
Other motivation might come from the (potential) need to resimulate all settlements on each block to have most accurate gas estimations.

Details

Maybe implementing function with a signature of

pub fn resimulate(self, ...) -> Option<Self> {
        // TODO
}

[github-actions]

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