Integrate the @Nahmii/SDK package

[HDauven]

Describe the solution you'd like Replace deposit and withdrawal functionality that currently exists in the bridge with equivalent functions from the @nahmii/SDK package. Add withdrawal finalization functionality through the SDK.

Additional context Integrating the SDK means that the withdraw and deposit functions from the ethereum.js util can be removed and the ABIs for the L1StandardBridge and the L2StandardBridge are obsolete.

Stepwise breakdown

• [x] Replace withdraw function with a SDK equivalent.
• [x] Replace the depositing of ETH and depositing of ERC20s with a SDK equivalent.
• [x] Remove the L1StandardBridge and L2StandardBridge ABIs.

Definition of done

• [x] Replace local deposit-withdraw functions with @nahmii/SDK equivalents.
• [x] Removal of unused local deposit-withdraw function and logic.