Delegate SAC Address require_auth calls to the token's admin address

[kalepail]

Relevant Discord discussion: https://discord.com/channels/897514728459468821/1310975759480914011

Currently there's no mechanic for gaining access to adding or modifying a SAC so the SAC address itself can get assets locked up without any means for doing anything with them.

E.g. I transfer funds to a SAC address. Now they're locked. It would be nice to permit a way to deal with this via forwarding require_auth calls to the SAC's admin Address. So you could for instance perform a transfer or burn from the SAC where the from require_auth forwarded to the token's admin Address vs the SAC address (which doesn't have a __check_auth)