Feature: Decode transaction (and request) calldata

[jxom]

The Request

The ability to see a humanized, decoded view of transaction (and request) calldata.

Problem

Currently, calldata is represented as an unreadable, encoded hex value.

Solution

As a user, I would like to see a humanized & decoded view of transaction calldata (function signature, arguments, revert reason/return data) on both the transaction details & transaction request screens.