Continued scaffolding and interface definitions

services/data_service/internal/node/node.go

@@ -0,0 +1,16 @@
+package node
+
+type Type string
+
+const (
+	Source    Type = "source"
+	Processor Type = "processor"
+	Sink      Type = "sink"
+)
+
+type Template struct {
+	Kind    Type
+	Type    string
+	Version string
+	Config  string
+}