TensorFlow functions are user-defined callable abstractions built from a graph
of operations, which represents the function body.

This directory contains function-specific code, spanning from the high-level,
tf.function API, down to (and excluding) the graph execution framework.

Create new directory for tf.function-specific implementation.
Create new directory for tf.function-specific implementation.

PiperOrigin-RevId: 411654855
Change-Id: Icdebd53845b3e284d88fc934c7bb90bfb16994ff
