Add host benchmarking

[chris124567]

No description provided.

[CtrlAltDefeat94]

Not sure if it's planned already. But it would be helpful to be able to benchmark hosts while reusing the existing contract, unlike benchyd where each benchmark creates a new contract.

[chris124567]

From a cost perspective I think it makes sense to have that as the goal.

[n8maninger]

I disagree. Stick with simplicity and do a short contract with 1 benchmark = 1 contract. Cost difference is negligible, but the implementation is significantly simpler when you can assume a new contract will need to be formed and you don't need to manage existing contracts.