support memo field routing

[turadg]

What is the Problem Being Solved?

#9042 had a story with memo field routing. We've reduced scope of that ticket and are deferring memo field routing to this one.

Dependencies

Beta Give feedback

1. codegen RPC clients #9200
   enhancement +1
   

Description of the Design

1. User invokes offer to have StakeAtom contract create a localchain account
   • Then user has a localchain Cosmos account
2. User IBC transfers ATOM (IBC Hub-Agoric) into their Agoric localchain account
   • StakeAtom-held localchain account receives assets
   • Memo field indicates invoking StakeAtom hook
   • ^ depends on the vtransfer PR
3. StakeAtom creates ICA on Cosmos Hub
4. StakeAtom triggers IBC send of ATOM to Cosmos Hub ICA
   • MsgTransfer with a memo indicating the Contract for acknowledgement
   • Localchain’s MsgTransfer sends via the transfer App
5. StakeAtom receives ack it has completed
6. StakeAtom triggers delegation to a Cosmos Hub validator

Security Considerations

Scaling Considerations

Test Plan

Upgrade Considerations