Replace DetrFeatureExtractor with DetrImageProcessor (#1)

- Replace DetrFeatureExtractor with DetrImageProcessor (31f397627aba57754b391b79560e4093cfb0ccb6)

preprocessor_config.json

@@ -1,5 +1,7 @@
 {
   "do_normalize": true,
+  "do_pad": true,
+  "do_rescale": true,
   "do_resize": true,
   "feature_extractor_type": "DetrFeatureExtractor",
   "format": "coco_detection",
@@ -8,11 +10,16 @@
     0.456,
     0.406
   ],
+  "image_processor_type": "DetrFeatureExtractor",
   "image_std": [
     0.229,
     0.224,
     0.225
   ],
-  "max_size": 1333,
-  "size": 800
+  "resample": 2,
+  "rescale_factor": 0.00392156862745098,
+  "size": {
+    "longest_edge": 1333,
+    "shortest_edge": 800
+  }
 }