Add dynamixel-sdk as extra

poetry.lock

@@ -4354,6 +4354,7 @@ test = ["big-O", "importlib-resources", "jaraco.functools", "jaraco.itertools",
 aloha = ["gym-aloha"]
 dev = ["debugpy", "pre-commit"]
 dora = ["gym-dora"]
+koch = ["dynamixel-sdk"]
 pusht = ["gym-pusht"]
 test = ["pytest", "pytest-cov", "pytest-mock"]
 umi = ["imagecodecs"]
@@ -4363,4 +4364,4 @@ xarm = ["gym-xarm"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.10,<3.13"
-content-hash = "c630f4de53b32deae37f469b747ce36dcccc183fedd03af7a1799d967f5ebdb3"
+content-hash = "81dc830d3d36c67e2fe2aea6cc30829eb2977edbf49a037df21a5f329a01aee5"

pyproject.toml

@@ -76,6 +76,7 @@ dev = ["pre-commit", "debugpy"]
 test = ["pytest", "pytest-cov", "pytest-mock"]
 umi = ["imagecodecs"]
 video_benchmark = ["scikit-image", "pandas"]
+koch = ["dynamixel-sdk"]
 
 [tool.ruff]
 line-length = 110