Export libtextclassifier

Note that the vocab annotator is disabled.

Bug: 157134682

Test: atest -p external/libtextclassifier/TEST_MAPPING

Merged-In: I2a80ff80af17ed3975b146b1cb51415625b620f1
Change-Id: I993a39a72183e7a284b2cee1429d21481806afbb
77 files changed