Expose tf.lookup.TextFileIndex in 2.0
Expose tf.lookup.TextFileIndex in 2.0

This fix tries to address the issue raised in 26622 where
tf.lookup.TextFileIndex was not exposed from public API
though it is used by tf.lookup.TextFileInitializer
which actually needs tf.lookup.TextFileIndex.

This fix exposed the tf.lookup.TextFileIndex.

This fix fixes 26622.

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

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