Payments can implement ERC6909

[wjmelements]

ERC6909 is a multitoken standard appropriate for internal balances. If we implement this standard, deposits could be more visible to the user, if a wallet or explorer supports ERC6909.

[wjmelements]

This change would also help with the datacap allocator.

[pali101]

@rjan90 Please assign it to me.

[rjan90]

Hey @pali101! Given that we have code-frozen payments for a while, I do not expect us to ship this anytime soo. Therefore I think there are probably better issues you can pick up at this point. I will see if I can find some higher prio issues and get can to you on Slack