Add macro to perform pluggy assertions

[Danielwsx64]

Motivation

Provide a better way to do assertions about Pluggy received conn

Proposed solution

• Added a function on bypass_expect macro's flow to send a message to caller after validate the conn. That message contains the most important conn data.
• Created macro assert_pluggy to listen process message and perform assertions with received conn
• Compile Bypass helpers just if Bypass module is loaded (most cases only in test environment)