Feat: implement up-gradable and access control

[Olowodarey]

• Integrated OpenZeppelin's upgradable Account contract.
• Added AccessControl for role-based permission management.
• Implemented function-level protection using only_owner (or relevant role modifier).
• Wrote Cairo tests to verify that only the contract owner can successfully call the protected function.

Test Coverage:

• Owner can call the restricted function.
• Non-owner call is correctly reverted.

[caxtonacollins]

@Olowodarey, please integrate the SNIP9 OutsideExecution component from OZ.

[caxtonacollins]

i have made some reviews that will close this pr, pls make the changes, run scarb fmt, scarb build and scarb test, before pushing.

[caxtonacollins]

please add this to storage:
// Custom storage for SyncPayment functionality
fiat_balance: Map<(ContractAddress, felt252), u128>, // (user, currency) => balance
token_address: Map<felt252, ContractAddress>, // symbol => token_address
default_fiat_currency: felt252,
liquidity_bridge: ContractAddress,
initialized: bool,