ci(pytest): fixture doctest namespace in pytest config

GitOrigin-RevId: 90ef1924dc69311f0945aa3d03923af968439c6f

imperative/python/megengine/conftest.py

+import pytest
+
+import megengine
+
+
+@pytest.fixture(autouse=True)
+def import_megengine_path(doctest_namespace):
+    doctest_namespace["mge"] = megengine
+    doctest_namespace["Tensor"] = megengine.Tensor
+    doctest_namespace["F"] = megengine.functional
+    doctest_namespace["M"] = megengine.module
+    doctest_namespace["Q"] = megengine.quantization
+    doctest_namespace["data"] = megengine.data
+    doctest_namespace["autodiff"] = megengine.autodiff
+    doctest_namespace["optim"] = megengine.optimizer
+    doctest_namespace["jit"] = megengine.jit
+    doctest_namespace["amp"] = megengine.amp
+    doctest_namespace["dist"] = megengine.distributed
+    doctest_namespace["tm"] = megengine.traced_module
+    doctest_namespace["hub"] = megengine.hub
+    doctest_namespace["utils"] = megengine.utils