`mitmproxy` guide and addon for automating wallet traffic analysis

[polymutex]

mitmproxy is an amazing tool to capture a software wallet's network traffic and look for data leaks, such as the user's Ethereum address.

It would be nice to have a guide for contributors on how to set up mitmproxy to capture a wallet's network traffic, and to have an addon that automatically filters and catches requests carrying identifying information, such as all requests that carry the user's Ethereum address.

[polymutex]

cc @nconsigny as this may also be somewhat useful in assessing wallet orderflow (by capturing which requests contain transaction data in them), though not with certainty.