feat: refactor handlers so they return deposit data intead of handler response

[mpetrun5]

Refactor handlers to they modify and return the deposit data and deprecate the handleResponse field.
Deposit data has to be modifed as the data submitted and stored on the source chain must be the same as the data sent to the executeProposals function on the destination for us to be able to do storage proofs.

Description

Related Issue Or Context

Closes: #3

How Has This Been Tested? Testing details.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Checklist:

• I have commented my code, particularly in hard-to-understand areas.
• I have ensured that all acceptance criteria (or expected behavior) from issue are met
• I have updated the documentation locally and in Sygma-docs.
• I have added tests to cover my changes.
• I have ensured that all the checks are passing and green, I've signed the CLA bot