res_hep: Capture actual transport type in use

Rather than hard-coding UDP, allow consumers of the HEP API to specify
which protocol is in use. Update the PJSIP provider to pass in the
current protocol type.

ASTERISK-26850 #close

Change-Id: I54bbb0a001cfe4c6a87ad4b6f2014af233349978

include/asterisk/res_hep.h

@@ -72,6 +72,8 @@ struct hepv3_capture_info {
 	size_t len;
 	/*! If non-zero, the payload accompanying this capture info will be compressed */
 	unsigned int zipped:1;
+	/*! The IPPROTO_* protocol where we captured the packet */
+	int protocol_id;
 };
 
 /*!