Expose tf.keras.preprocessing.text.tokenizer_from_json to match keras API
Expose tf.keras.preprocessing.text.tokenizer_from_json to match keras API

This fix tries to address the issue raised in 30061 where
`tf.keras.preprocessing.text.tokenizer_from_json` is not available,
while in keras, `keras.preprocessing.text.tokenizer_from_json` is available.

This fix expose `tf.keras.preprocessing.text.tokenizer_from_json` and
alias to `keras.preprocessing.text.tokenizer_from_json`, like all other
similiar APIs in the same keras_proprocessing/text.py

This fix fixes 30061.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

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