Add analogous models to `DataModel` for `IAccountStateDelta.GetState()` and `IAccountStateDelta.SetState()`

[greymistcube]

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Something like

StateModel state = states.GetState<StateModel>(address);

// Do stuff.

states.SetState(address, state.Encode());

might be nice to have. 🙄

This is more complicated than DataModel as Bencodex parameter type for GetState() and SetState() isn't limited to Bencodex.Types.Dictionary. This might require more thought during the design stage. 😶

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