Add SNIP-9 to An Account Abstraction contract

[lana-shanghai]

Description

Add SNIP-9 to the code of an Agent's Account Abstraction contract.

Refer to the standard account functions in the docs.
Use scarb package manager.

Acceptance Criteria

Contract compiles and deploys on Starknet Sepolia successfully.
Contract is able to pass a dummy call to a trivial one value storage update contract.
Test suite passes successfully.

[StarkFishinator]

Hi, can I get assigned to this issue?