Ios Identity Document Projection State
@Serializable
Desired IdentityDocumentServices registration state of the one wallet that owns this App Group.
One wallet rather than a union of several: Apple hands the provider extension the parsed request, the requesting origin, sendResponse and cancel, but not the matched registration's documentIdentifier, so an extension cannot tell which wallet a request was registered for. The wallet that refreshed last is the active one, and walletId names the wallet_${walletId} database the extension must open.