feat(utils): extend import check util (#2820)

* refactor(utils): is_package_available now differentiate between pkg name and module name

* refactor(tests): update require_package decorator

tests/async_inference/test_policy_server.py

@@ -62,7 +62,7 @@ class MockPolicy:
 
 
 @pytest.fixture
-@require_package("grpc")
+@require_package("grpcio", "grpc")
 def policy_server():
     """Fresh `PolicyServer` instance with a stubbed-out policy model."""
     # Import only when the test actually runs (after decorator check)