support/testing: add python-gymnasium tests

Add a basic runtime test for the python-gymnasium package.
This test verifies the fundamental operations of the library by:
- Importing `gymnasium`.
- Creating a "CartPole-v1" environment.
- Resetting the environment.
- Taking a random action step.
- Closing the environment.

Signed-off-by: Xukai Wang <kingxukai@zohomail.com>
[Julien:
 - sort DEVELOPERS entries alphabetically
 - fix file name typo in DEVELOPERS
 - remove selection of dependencies in test config
]
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -3485,8 +3485,10 @@ F:	package/python-farama-notifications/
 F:	package/python-gymnasium/
 F:	support/testing/tests/package/sample_python_cloudpickle.py
 F:	support/testing/tests/package/sample_python_farama_notifications.py
+F:	support/testing/tests/package/sample_python_gymnasium.py
 F:	support/testing/tests/package/test_python_cloudpickle.py
 F:	support/testing/tests/package/test_python_farama_notifications.py
+F:	support/testing/tests/package/test_python_gymnasium.py
 
 N:	Yair Ben Avraham <yairba@protonmail.com>
 F:	package/casync/

support/testing/tests/package/sample_python_gymnasium.py

@@ -0,0 +1,8 @@
+import gymnasium as gym
+env = gym.make("CartPole-v1")
+
+observation, info = env.reset()
+random_action = env.action_space.sample()
+next_observation, reward, terminated, truncated, info = env.step(random_action)
+
+env.close()

support/testing/tests/package/test_python_gymnasium.py

@@ -0,0 +1,12 @@
+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonPy3Gymnasium(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_GYMNASIUM=y
+        """
+    sample_scripts = ["tests/package/sample_python_gymnasium.py"]
+    timeout = 20