Make simulation independent of private key

[ValarDragon]

Summary

We should make the simulation for gas calculation independent of the private key. ref #2047 (comment)

Reasoning is: increases applicability of side channel attacks, increases private key exposure, weird UI (approving 2 txs on ledger), and if that signature is recovered, it can be propagated to more of the network which will burn your fees. (as you get an out of gas error)

Once this is done, we can enable simulation by default in the CLI.

[alexanderbez]

Think this should be #prelaunch

[ValarDragon]

ref #2047 (comment)

I don't understand the push for this to be prelaunch, let alone next release. (Note this contradicts what I said earlier in the issue) Its a nice to have (and a really cool thing at that), but something we can roll out in a non-breaking manner. The more features we keep trying to add prelaunch that aren't necessary, the longer it will take to launch.

[ValarDragon]

Per discussion in sdk meeting, this being prelaunch is tied to our decision on gas, which is dependent on iavl benchmarks.

[jackzampolin]

Is this still prelaunch? We don't have any IAVL benchmarks rn...

[ValarDragon]

I don't follow with any of the new labels? Was simulation of txs for gas made default without doing this? If so I think we should undo that decision and wait until this is complete.

[alessio]

Are we 100% sure this is launch blocker?

[jackzampolin]

Is this still an issue? Didn't you just fix this in the LCD PR you just pushed @alexanderbez

[alexanderbez]

Yes it is @jackzampolin -- although I'm not quite sure what @ValarDragon means.

[jackzampolin]

Going to go ahead and close this issue then.