Feat/cross contract

[ummarig]

Implemented

• Added a new helper crate: opsce

  • cross_contract.rs
  • lib.rs

• Extended multisig_transfer:

  • storage.rs
    • Added AssetsUpContract storage key
    • Added get_assetsup_contract / set_assetsup_contract
  • lib.rs
    • Added configure_assetsup_contract(...) admin setter
    • Added token_id and amount fields to transfer requests
    • Updated execute_transfer(...) to:
      • look up configured assetsup_contract_id
      • invoke AssetsUpClient::transfer_tokens(...)
      • revert on cross-contract failure
  • types.rs
    • Added cross-contract transfer payload fields
  • errors.rs
    • Added AssetsUpContractNotConfigured and AssetTransferFailed

• Added unit tests in tests.rs

  • Mocks successful assetsup transfer
  • Mocks failing assetsup transfer and verifies revert

• Updated workspace manifests:

  • Cargo.toml
  • Cargo.toml

Notes

Closes #815
Closes #820

• Cross-contract call now uses Soroban contractclient wrapper via AssetsUpClient.
• Admin can configure/replace the assetsup_contract_id for the multisig wallet.

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