localization: add default launch and dag file.

modules/localization/dag/localization.dag

+# Define all coms in DAG streaming.
+module_config {
+    module_library : "/apollo/bazel-bin/modules/localization/rtk/librtk_localization_component.so"
+
+    components {
+      class_name : "RTKLocalizationComponent"
+      config {
+        name : "rtk_localization"
+        config_file_path : "/apollo/modules/localization/conf/rtk_localization.pb.txt"
+        readers: [
+          {
+            channel: "/apollo/sensor/gnss/odometry"
+          }
+        ]
+      }
+    }
+}
\ No newline at end of file

modules/localization/launch/localization.launch

+<cybertron>
+    <module>
+        <name>localization</name>
+        <dag_conf>/apollo/modules/localization/dag/localization.dag</dag_conf>
+        <process_name>localization</process_name>
+    </module>
+</cybertron>