Implementing a fused version of shuffle and repeat. The logic is incorporated...

Implementing a fused version of shuffle and repeat. The logic is incorporated into the existing `tf.data.Dataset.shuffle_and_repeat` transformation.

Fusing of shuffle and repeat is expected to benefit the performance of pipelines with deep shuffle buffers and/or short epochs as it removes the per epoch initialization of the shuffle buffer.

PiperOrigin-RevId: 179431675