[zip] Make implementations of zip interfaces final

This is to prepare them to the changes in the interfaces that
remove virtual destructors

Bug: 237583012
Test: build

Merged-In: I60a28bcd4f0ef332bb2243f2feac4eedb908011f
Change-Id: I60a28bcd4f0ef332bb2243f2feac4eedb908011f