Expand native support with optional contract call

[MakMuftic]

We want to support the functionality of transferring native tokens in conjunction with a contract call.
An example use case would be: I want to buy NFT on the destination chain with the native token on the source chain (think L2s ETH), so I only execute one transaction that encodes the contract call (in this case, the mint method on the NFT contract) and also encodes the native transfer.

Implementation details

• Alter the current Native Handler and Native Adapter contracts so they allow sending either just native asset deposit or native asset deposit + contract call

Testing details

• Unit tests

Acceptance Criteria

• Functional Native Handler and Adapter that allow for native token deposit + contract call
• Passing unit tests