Add initial MQTT scrubber service scaffold

internal/model/model.go

@@ -0,0 +1,16 @@
+package model
+
+import "time"
+
+type RawMessage struct {
+	Topic      string
+	Payload    []byte
+	ReceivedAt time.Time
+}
+
+type Record struct {
+	Measurement string
+	Tags        map[string]string
+	Fields      map[string]any
+	Timestamp   time.Time
+}