Convert TensorFlow Lite API navigation to use accordion style.
Convert TensorFlow Lite API navigation to use accordion style.

This is in preparation for importing the new Lite Java APIs, which are quite
lengthy. Using accordion sections keeps things tidy when the sections are
large.

The `platform` additions are purely semantic.

PiperOrigin-RevId: 394793465
Change-Id: Iba238cee60b17e0dc9f5bb17f739923a2a4af27f

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