feat: add tracefunnel module and handler

Signed-off-by: Shivanshu Raj Shrivastava <shivanshu1333@gmail.com>

pkg/modules/tracefunnel/tracefunnel.go

@@ -0,0 +1,41 @@
+package tracefunnel
+
+import (
+	"context"
+	"net/http"
+
+	traceFunnels "github.com/SigNoz/signoz/pkg/types/tracefunnel"
+)
+
+// Module defines the interface for trace funnel operations
+type Module interface {
+	Create(ctx context.Context, timestamp int64, name string, userID string, orgID string) (*traceFunnels.Funnel, error)
+
+	Get(ctx context.Context, funnelID string) (*traceFunnels.Funnel, error)
+
+	Update(ctx context.Context, funnel *traceFunnels.Funnel, userID string) error
+
+	List(ctx context.Context, orgID string) ([]*traceFunnels.Funnel, error)
+
+	Delete(ctx context.Context, funnelID string) error
+
+	Save(ctx context.Context, funnel *traceFunnels.Funnel, userID string, orgID string) error
+
+	GetFunnelMetadata(ctx context.Context, funnelID string) (int64, int64, string, error)
+}
+
+type Handler interface {
+	New(http.ResponseWriter, *http.Request)
+
+	UpdateSteps(http.ResponseWriter, *http.Request)
+
+	UpdateFunnel(http.ResponseWriter, *http.Request)
+
+	List(http.ResponseWriter, *http.Request)
+
+	Get(http.ResponseWriter, *http.Request)
+
+	Delete(http.ResponseWriter, *http.Request)
+
+	Save(http.ResponseWriter, *http.Request)
+}