output: adding in constants for event types

This change adds in the constants from the fluent-bit repository for output types.
These can be used in the go modules to then set the event type.

Signed-off-by: jmccormick7 <jcm258@case.edu>

Author: jmccormick7

output/flb_output.h

@@ -20,6 +20,10 @@
 #ifndef FLBGO_OUTPUT_H
 #define FLBGO_OUTPUT_H
 
+#define FLB_OUTPUT_LOGS    1
+#define FLB_OUTPUT_METRICS 2
+#define FLB_OUTPUT_TRACES  4
+
 struct flb_api {
     char *(*output_get_property) (char *, void *);
     char *_;

output/output.go

@@ -36,6 +36,9 @@ const (
 
 	FLB_PROXY_OUTPUT_PLUGIN = C.FLB_PROXY_OUTPUT_PLUGIN
 	FLB_PROXY_GOLANG        = C.FLB_PROXY_GOLANG
+	FLB_OUTPUT_LOGS         = C.FLB_OUTPUT_LOGS
+	FLB_OUTPUT_METRICS      = C.FLB_OUTPUT_METRICS
+	FLB_OUTPUT_TRACES       = C.FLB_OUTPUT_TRACES
 )
 
 // Local type to define a plugin definition