Add `build_adaptive_zeroing_mean_process` to tff.utils symbols.

PiperOrigin-RevId: 322649697

tensorflow_federated/python/core/utils/BUILD

@@ -14,6 +14,7 @@ py_library(
         "//tensorflow_federated/python/core:__pkg__",
     ],
     deps = [
+        ":adaptive_zeroing",
         ":computation_utils",
         ":differential_privacy",
         ":encoding_utils",

tensorflow_federated/python/core/utils/__init__.py

@@ -19,6 +19,7 @@ the latter is set to private and should remain such. The code in utils must not
 depend on implementation classes. It should be written against the Core API.
 """
 
+from tensorflow_federated.python.core.utils.adaptive_zeroing import build_adaptive_zeroing_mean_process
 from tensorflow_federated.python.core.utils.computation_utils import StatefulAggregateFn
 from tensorflow_federated.python.core.utils.computation_utils import StatefulBroadcastFn
 from tensorflow_federated.python.core.utils.computation_utils import update_state