Refactor responsibilities out from single class

[technicalpickles]

Right now, the Prosopite does quite a bit. I think it could be helpful to refactor out some of the logic into their own classes to better encapsulate the behavior. The main areas I can identify so far are:

• configuration
• notifying
• fingerprinting
• scanning (scan, start, stop, subscribing to activerecord events)

I kinda started a branch for this already, but I figured I'd gauge interest appetite before dropping a big PR 😅