implemented the transfer

[nafiuishaaq]

Completed

Implemented two-step admin transfer support in the assetsup contract.

Changes made

• Added admin_transfer.rs

  • propose_admin_transfer(env, new_admin)
  • accept_admin_transfer(env)
  • cancel_admin_transfer(env)
  • get_pending_admin(env)
  • Emits admin_transfer_proposed and admin_transfer_completed

• Updated lib.rs

  • Added DataKey::PendingAdmin
  • Registered pub(crate) mod admin_transfer;

• Extended admin.rs

  • Happy path: propose + accept
  • Non-admin propose fails
  • Wrong address accept fails
  • Cancel and re-propose behavior

Note

I implemented this in admin_transfer.rs because this workspace contains the assetsup contract rather than a contracts/opsce folder.

Made changes.

Closes #819
Closes #812

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