Convert datasets to av1 encoding (#302)

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

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 version https://git-lfs.github.com/spec/v1
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-size 33
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+size 188

tests/data/lerobot/xarm_lift_medium_replay/meta_data/stats.safetensors

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
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-size 2808
+oid sha256:b6cfcf6051a043dfb16d797fe382ef786b3f818f8ff35a53ecf139f22258d3c3
+size 2832

tests/data/lerobot/xarm_lift_medium_replay/train/data-00000-of-00001.arrow

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-oid sha256:6cd7ec39ea00a835df2b2c9816e2ea826025c73d89e2cf5bc10cbda0298e7393
-size 4920
+oid sha256:0c7cd6da7622e4b1e70c2dc6caa9e9ba8f4078c9eb3457b641ebd1b247a5bec4
+size 5024

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

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8133fe105b6e35182c4e24d8ac092730cb8f684f6591e4f1b3a4a2adaf224c46
+oid sha256:a219f973d6535f40737265fd15d81944aabf8eb7527384d28c507926bfa89f25
 size 912

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

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:71f84c95ef32e00060d1658cb601be1bc640a85b9e7200a3af481ba93c145de0
+oid sha256:2fe3dd3ea15dfe189dda76cc7706123ff3acd70ec1e3190a07ef5fc5e9e7aeb7
 size 247

tests/data/lerobot/xarm_lift_medium_replay/videos/observation.image_episode_000000.mp4

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c52aad4a19a772af655b43218cb6920c140f5bcc32b34a40b9b1932f5eeae071
-size 17903
+oid sha256:58aef7a5ed81ceafd948d30e8c8ecb66f417962c3856a662fbf37e9230a0d946
+size 21161