feat: support human readable struct inputs

[mattsse]

Motivation

Support custom structs as contract params in human readable abi

Solution

• keep track of the function's types (input, output) in the abi parser, this is added on top the existing parser and adds a bit more verbosity in to the param parse functions...
• reuse the existing InternalStructs when determine function inputs

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[gakonst]

godlike