Implement begining of migration

Move Function/Query definition

src/main/kotlin/fr/postgresjson/definition/Resource.kt

@@ -0,0 +1,13 @@
+package fr.postgresjson.definition
+
+import java.io.File
+
+interface Resource {
+    val name: String
+    val script: String
+    var source: File?
+}
+
+interface ResourceCollection {
+    val parameters: List<Parameter>
+}