feat: establish Orbit models, migrations and development baseline

platform/model/state.go

@@ -0,0 +1,10 @@
+package model
+
+type DeliveryState string
+
+const (
+	DeliveryPending DeliveryState = "PENDING"
+	DeliveryLeased  DeliveryState = "LEASED"
+	DeliveryAcked   DeliveryState = "ACKED"
+	DeliveryExpired DeliveryState = "EXPIRED"
+)