Add UMI-gripper dataset (#83)

Co-authored-by: Remi <re.cadene@gmail.com>

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

@@ -0,0 +1,3 @@
+{
+    "fps": 10
+}

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

@@ -0,0 +1,67 @@
+{
+  "citation": "",
+  "description": "",
+  "features": {
+    "observation.state": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 7,
+      "_type": "Sequence"
+    },
+    "episode_index": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "frame_index": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "timestamp": {
+      "dtype": "float32",
+      "_type": "Value"
+    },
+    "episode_data_index_from": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "episode_data_index_to": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "end_pose": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 6,
+      "_type": "Sequence"
+    },
+    "start_pos": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 6,
+      "_type": "Sequence"
+    },
+    "gripper_width": {
+      "feature": {
+        "dtype": "float32",
+        "_type": "Value"
+      },
+      "length": 1,
+      "_type": "Sequence"
+    },
+    "index": {
+      "dtype": "int64",
+      "_type": "Value"
+    },
+    "observation.image": {
+      "_type": "Image"
+    }
+  },
+  "homepage": "",
+  "license": ""
+}

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

@@ -0,0 +1,13 @@
+{
+  "_data_files": [
+    {
+      "filename": "data-00000-of-00001.arrow"
+    }
+  ],
+  "_fingerprint": "fd95ee932cb1fce2",
+  "_format_columns": null,
+  "_format_kwargs": {},
+  "_format_type": "torch",
+  "_output_all_columns": false,
+  "_split": null
+}