Feature request: Add a "onBalanceChange(...)" event

[honungsburk]

Motivation

My website https://native-asset.com/ would like access to such an endpoint since that would allow me to update the GUI whenever assets have been successfully minted/burned. For example, the app currently doesn't allow you to burn more tokens than you have in your wallet. However, this value becomes invalid after minting/burning and currently you need to refresh the entire app to get the correct values. A onBalanceChange(...) event would significantly improve the UX for the user, allowing the app to do this automatically.

Proposed Function Signature

cardano.onBalanceChange((balance : value) => void)

[honungsburk]

I'll close this issue in favor of the discussion happening on the CIP draft