Implement simulation for `MsgCreateClient`

[giunatale]

I've noticed the implementation for this simulation is empty, and contains a TODO.

We should eventually implement this message simulation.

[lumtis]

Yes although this message simulation will be more complex to implement since the completion depends in some way on external event: fetching the consensus state and validator set of launched chain and parsing the values with the values in the launch module. This will require to craft consensus state and validator state from GenesisValidator that have been set in the launch module for specific launch ID