Move convert_to_tensor, convert_to_tensor_v1, convert_to_tensor_v1_with_dispatch, convert_to_tensor_v2_with_dispatch, and convert_to_tensor_v2 into tensor_conversion_registry.

Also renaming `tensor_conversion_registry` to `tensor_conversion` to match.

PiperOrigin-RevId: 515693810

Author: BrianWieder

mesh_tensorflow/tpu_variables.py

@@ -24,7 +24,7 @@
 
 # pylint: disable=g-direct-tensorflow-import
 from tensorflow.python.framework import ops
-from tensorflow.python.framework import tensor_conversion_registry
+from tensorflow.python.framework import tensor_conversion
 from tensorflow.python.ops import control_flow_ops
 from tensorflow.python.ops import gen_resource_variable_ops
 
@@ -224,7 +224,7 @@ def _tensor_conversion(var, dtype=None, name=None, as_ref=False):
   return var._dense_var_to_tensor(dtype=dtype, name=name, as_ref=as_ref)  # pylint: disable=protected-access
 
 
-tensor_conversion_registry.register_tensor_conversion_function(
+tensor_conversion.register_tensor_conversion_function(
     ReplicatedVariable, _tensor_conversion)
 
 if not TF_23: