lib: refactor gsmtap/gsmtap_parser into a single module

This'll allow us to break out more specific GSMTAP parsing into
submodules more easily.

daemon/src/pcap.rs

@@ -10,7 +10,7 @@ use axum::http::StatusCode;
 use axum::http::header::CONTENT_TYPE;
 use axum::response::{IntoResponse, Response};
 use log::error;
-use rayhunter::gsmtap_parser;
+use rayhunter::gsmtap::parser as gsmtap_parser;
 use rayhunter::pcap::{GpsPoint, GsmtapPcapWriter};
 use rayhunter::qmdl::QmdlMessageReader;
 use std::sync::Arc;