Add message enc&dec for F1AP Initial UL RRC msg, and test

Co-authored-by: Guido Casati <hello@guidocasati.com>

openair2/F1AP/lib/f1ap_lib_includes.h

@@ -23,5 +23,9 @@
 #define F1AP_LIB_INCLUDES_H_
 
 #include "F1AP_F1AP-PDU.h"
+#include "F1AP_InitialULRRCMessageTransfer.h"
+#include "F1AP_InitiatingMessage.h"
+#include "F1AP_NRCellIdentity.h"
+#include "F1AP_ProtocolIE-Field.h"
 
 #endif /* F1AP_LIB_INCLUDES_H_ */