Authz SendAuthorization allow list

[alphaBiota]

Summary

Add an allow list, an optional list of addresses allowed to receive bank assets via the granted authz MsgSend.

Problem Definition

One feature I wish authz had, would be the ability to specify which wallet addresses a grantee is allowed to send funds to when they are sending on behalf of the grantor using the cosmos.bank.v1beta1.MsgSend message command.

The auth SendAuthorization does allow the SpendLimit to be specified, but not to whom it can be spent.

I could see many use cases for adding this feature; the grantee could sign transactions that facilitate distributions of funds from a validator, or from a treasury wallet, to a list of specified recipient wallets, thus ensuring that funds flow only to authorized accounts.

Proposal

A store AllowList would be needed along with SpendLimit
AllowList would contain a list of addresses authorized to receive bank assets

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[alphaBiota]

Merge with #11700 ?

[alexanderbez]

Yes, this is a dup of #11700, but this is somewhat better described so I'll keep this open and close #11700.

As for the proposal itself, it makes sense to me. I wonder if this is something that fits into the "general enough" category to warrant not having the app dev do it for their chain only. WDYT @AmauryM?

[amaury1093]

Yeah it seems like 2 independant users asked for the same feature, which also looks like a useful authz, so I'm fine with adding this to the SDK 👍

Any one of you @carameleon or @paplco wants to work on a PR?

[likhita-809]

I can work on this