Add ShadowJar compatibility and Query file can be define name with comment

Add Migration and Query definition class
Add Docker DB for tests

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

@@ -0,0 +1,35 @@
+package fr.postgresjson.definition
+
+import java.nio.file.Path
+
+class Migration(
+    override val script: String,
+    source: Path
+) : Resource {
+    override val name: String
+    val direction: Direction
+    override var source: Path? = null
+
+    init {
+        this.source = source
+        this.direction = source.fileName.toString()
+            .let {
+                when {
+                    it.endsWith(".down.sql") -> Direction.DOWN
+                    it.endsWith(".up.sql") -> Direction.UP
+                    else -> throw MigrationNotFound()
+                }
+            }
+        this.name = source.fileName.toString()
+            .substringAfterLast("/")
+            .let {
+                when (direction) {
+                    Direction.DOWN -> it.substringBefore(".down.sql")
+                    Direction.UP -> it.substringBefore(".up.sql")
+                }
+            }
+    }
+
+    class MigrationNotFound(cause: Throwable? = null) : Resource.ParseException("Migration not found in script", cause)
+    enum class Direction { UP, DOWN }
+}