Update LSTM/GRU v2 to allow the extension from tf.lite.
Update LSTM/GRU v2 to allow the extension from tf.lite.

So far we didn't find a good way to unify the function attributes
between 'api_implements' and '_implements'. We leave them separated at
this stage to unblock the work on tf.lite side.

Should revisit this when we have more spare cycle.

PiperOrigin-RevId: 298971393
Change-Id: Ifd97262e85695b84f677800e978af245e4296bb0

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