feat: add configuration parsing and job definitions

Add a YAML config schema for migration jobs (source/target schema, table, primary key, options) and parse it at startup.

cmd/go_migrate/log.go

@@ -10,6 +10,8 @@ func configureLog() {
 	log.SetFormatter(&log.TextFormatter{
 		FullTimestamp:   true,
 		TimestampFormat: time.StampMilli,
+		DisableSorting:  false,
+		PadLevelText:    true,
 	})
-	log.SetLevel(log.DebugLevel)
+	log.SetLevel(log.InfoLevel)
 }