Inflate model state, so that additional vacc class compartments are created but zerod. Use this to run the model for a while, then set it up to work with new vacc classes (e.g. booster doses).
inflate_state_vacc_classes(state1, info1, info2)The state matrix with X vacc classes
The model info with X vacc classes
The model info with Y > X vacc classes
An expanded model state with Y > X vacc classes