Explore alternative storage pattern for ChildAccount metadata views

[sisyphusSmiling]

In the recent community review, it was mentioned that the storage pattern for ChildAccount metadata felt counter to the access pattern. That is, the Display settable by the parent account (via Manager) is stored in ChildAccount which is stored in the child account while the Display settable by the child account (in OwnedAccount).

A storage pattern that's consistent with the access pattern would entail storing the parent settable display in the parent account and child settable display in the child account. We should briefly explore what this would look like in the current HybridCustody contract and submit a PR as a point of conversation around the potential change.

[sisyphusSmiling]

Closed by #119