Add a way to revoke multiple approvals one after the other

[rkalis]

Many people have requested whether we can let them revoke multiple approvals in a single click. I don't want to blindly send like 20 sendTransaction requests to the wallet since that encourages users to just click "accept" without looking at their transaction popups.

But perhaps what we can do is set up a process where a user selects approvals they want to revoke and then clicks "batch revoke". This then opens a modal that shows the approvals one by one, so that the MetaMask popups get triggered one at a time and there is a clear overview of the progress through spinners / checkmarks / progress bars.