arbitrary well-known ERTP asset support in smart wallet

[dckc]

What is the Problem Being Solved?

The smart wallet supports vbank assets only (i.e. cosmos x/bank accounts reflected as ERTP purses); this suffices for the PSM and Vaults application, but not arbitrary ERTP assets as requested in #7226.

Description of the Design

Tasks

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1. "join game" use case illustrates requirements
2. failing test case
3. happy-path implementation
4. how to handle displayInfo? (e.g. decimalPlaces but also assetKind to distinguish NFT from fungible)
5. watch already-stored purses; add invitationPurse to brandToPurses in finish?
6. chore(smart-wallet): don't try to distinguish presences statically #8120
   +0
7. upgrade walletFactory (incl. test)
8. publish displayInfo of all well-known brands under boardAux

Security Considerations

Forgery risks around issuer/brand naming (#7226, #4819, #1449) are avoided by only supporting issuers from agoricNames.

Scaling Considerations

n/a?

Test / Upgrade Considerations

noted in the design list above