Add support for AFF4

Support for AFF4 forensic images

[http://www2.aff4.org/](http://www2.aff4.org/|smart-link) 

REDACTED USER will help supply image for testing

Motivation: faster extraction of data from apple silicon Mac systems

Inspiration:

[https://github.com/aff4/pyaff4](https://github.com/aff4/pyaff4|smart-link) 