app-layer: API calls to check for TX aware proto

Introduce AppLayerParserProtocolIsTxAware which returns 1 if protocol
is Tx aware, 0 if not.

src/app-layer-parser.c

@@ -881,6 +881,14 @@ int AppLayerParserHasDecoderEvents(uint8_t ipproto, AppProto alproto,
     SCReturnInt(1);
 }
 
+int AppLayerParserProtocolIsTxAware(uint8_t ipproto, AppProto alproto)
+{
+    SCEnter();
+    int ipproto_map = FlowGetProtoMapping(ipproto);
+    int r = (alp_ctx.ctxs[ipproto_map][alproto].StateGetTx == NULL) ? 0 : 1;
+    SCReturnInt(r);
+}
+
 int AppLayerParserProtocolIsTxEventAware(uint8_t ipproto, AppProto alproto)
 {
     SCEnter();

src/app-layer-parser.h

@@ -175,6 +175,7 @@ int AppLayerParserParse(AppLayerParserThreadCtx *tctx, Flow *f, AppProto alproto
 void AppLayerParserSetEOF(AppLayerParserState *pstate);
 int AppLayerParserHasDecoderEvents(uint8_t ipproto, AppProto alproto, void *alstate, AppLayerParserState *pstate,
                         uint8_t flags);
+int AppLayerParserProtocolIsTxAware(uint8_t ipproto, AppProto alproto);
 int AppLayerParserProtocolIsTxEventAware(uint8_t ipproto, AppProto alproto);
 int AppLayerParserProtocolSupportsTxs(uint8_t ipproto, AppProto alproto);
 void AppLayerParserTriggerRawStreamReassembly(Flow *f);