asset-swapper: Quote report pass back optional fill data

[kimpers]

Description

By passing back the fillData from the DEX samples we can estimate the gas usage.

Testing instructions

Types of changes

Checklist:

• [x] Prefix PR title with [WIP] if necessary.
• [x] Add tests to cover changes as needed.
• [ ] Update documentation as needed.
• [x] Add new entries to the relevant CHANGELOG.jsons.