Move renderer.py and gl_context.py into a submodule.

PiperOrigin-RevId: 870789311
Change-Id: Iaa0fcc764a770eeb4570a6a189a5ad032d41d64c

python/mujoco/rendering/classic/__init__.py

@@ -0,0 +1,16 @@
+# Copyright 2026 DeepMind Technologies Limited
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+
+# Empty.