lib: add Analyzer trait

This trait will be implemented by all of our heuristics, giving
us a uniform interface for collecting events and displaying them
to the user.

lib/src/lib.rs

@@ -8,3 +8,4 @@ pub mod gsmtap;
 pub mod gsmtap_parser;
 pub mod pcap;
 pub mod lte_rrc;
+pub mod analysis;