Move MediaType import to top level

Author: ovalle15

examples/annotation_import/tiled.ipynb

@@ -113,11 +113,10 @@
         "import cv2\n",
         "import ndjson\n",
         "\n",
-        "from labelbox import Client, LabelingFrontend, LabelImport, MALPredictionImport, OntologyBuilder, Tool , Classification, Option\n",
+        "from labelbox import Client, LabelingFrontend, LabelImport, MALPredictionImport, OntologyBuilder, Tool , Classification, MediaType, Option\n",
         "from labelbox.data.serialization.ndjson.converter import NDJsonConverter\n",
         "from labelbox.data.annotation_types.data.tiled_image import TiledBounds, TiledImageData, TileLayer, EPSG, EPSGTransformer\n",
         "from labelbox.schema.queue_mode import QueueMode\n",
-        "from labelbox.schema.media_type import MediaType\n",
         "from labelbox.data.annotation_types import (\n",
         "    Label, ImageData, ObjectAnnotation, \n",
         "    Rectangle, Point, Line, Polygon,\n",