Add video decoding to LeRobotDataset (#92)

tests/data/lerobot/umi_cup_in_the_wild/meta_data/info.json

@@ -1,3 +1,4 @@
 {
-    "fps": 10
+    "fps": 10,
+    "video": 1
 }

tests/data/lerobot/umi_cup_in_the_wild/train/dataset_info.json

@@ -2,6 +2,9 @@
   "citation": "",
   "description": "",
   "features": {
+    "observation.image": {
+      "_type": "VideoFrame"
+    },
     "observation.state": {
       "feature": {
         "dtype": "float32",
@@ -57,9 +60,6 @@
     "index": {
       "dtype": "int64",
       "_type": "Value"
-    },
-    "observation.image": {
-      "_type": "Image"
     }
   },
   "homepage": "",

tests/data/lerobot/umi_cup_in_the_wild/train/state.json

@@ -4,10 +4,10 @@
       "filename": "data-00000-of-00001.arrow"
     }
   ],
-  "_fingerprint": "fd95ee932cb1fce2",
+  "_fingerprint": "c8b78ec1bbf7a579",
   "_format_columns": null,
   "_format_kwargs": {},
-  "_format_type": "torch",
+  "_format_type": null,
   "_output_all_columns": false,
   "_split": null
 }