feat(api-core): Implement PEP 0810 lazy loading in gapic_v1

Author: hebaalazzeh

packages/google-api-core/google/api_core/gapic_v1/__init__.py

@@ -12,12 +12,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from google.api_core.gapic_v1 import client_info
-from google.api_core.gapic_v1 import config
-from google.api_core.gapic_v1 import config_async
-from google.api_core.gapic_v1 import method
-from google.api_core.gapic_v1 import method_async
-from google.api_core.gapic_v1 import routing_header
+import sys
+import typing
+
+__lazy_modules__ = {
+    f"{__name__}.client_info",
+    f"{__name__}.config",
+    f"{__name__}.config_async",
+    f"{__name__}.method",
+    f"{__name__}.method_async",
+    f"{__name__}.routing_header",
+}
+
+if typing.TYPE_CHECKING or sys.version_info < (3, 15):
+    from google.api_core.gapic_v1 import client_info
+    from google.api_core.gapic_v1 import config
+    from google.api_core.gapic_v1 import config_async
+    from google.api_core.gapic_v1 import method
+    from google.api_core.gapic_v1 import method_async
+    from google.api_core.gapic_v1 import routing_header
 
 __all__ = [
     "client_info",