Y/N Confirmation when sending a transaction via the CLI

[hthillman]

Split out from #2106

Whenever the Livepeer CLI will submit a transaction, we should require confirmation from the user. If an action will submit multiple transactions, the user should be warned in advance

[noisersup]

Can I work on it?

[hthillman]

yes, thanks for getting involved! we'll get you some feedback on that PR as soon as possible

[hthillman]

looks like this has been merged, thanks @noisersup! closing 👍