add simulate command

[niklasad1]

The idea is to have a way to "simulate" the validator set with different configurations such size of the "winning set" and see how it affect the score and similar.

See https://polkadot.polkassembly.io/proposal/23

[kianenigma]

@wpank needs this, and I think it is really a low hanging fruit as most of the code is already there. Happy to help out if initial direction is needed.