fix: remove ITracking interface in favour of Tracker (#365)

Signed-off-by: Sahid Velji <sahidvelji@gmail.com>
Co-authored-by: Simon Schrottner <simon.schrottner@dynatrace.com>

Author: sahidvelji

openfeature/interfaces.go

@@ -47,7 +47,7 @@ type IClient interface {
 	State() State
 
 	IEventing
-	ITracking
+	Tracker
 }
 
 // IEventing defines the OpenFeature eventing contract
@@ -56,11 +56,6 @@ type IEventing interface {
 	RemoveHandler(eventType EventType, callback EventCallback)
 }
 
-// ITracking defines the Tracking contract
-type ITracking interface {
-	Track(ctx context.Context, trackingEventName string, evalCtx EvaluationContext, details TrackingEventDetails)
-}
-
 // evaluationImpl is an internal reference interface extending IEvaluation
 type evaluationImpl interface {
 	IEvaluation