[Zucchini] ZTF Apply Fuzzer

This is part of a series of Fuzzers to be added to Zucchini for
security review. This tests the full patch application logic
exercising the patch reader and apply process. It covers ~33% of code
in 1000000 runs. The bulk of remaining code ~40% is covered by ZTF Gen
Fuzzer. With the remainder (~30%) being for DEX Disassembly (not in
launch scope), patch serialization (trusted input), and other
testing/debugging/error handling code which isn't triggered.

This already found a couple bugs fixed in
https://chromium-review.googlesource.com/c/chromium/src/+/1072272

With the supplied seed corpus the fuzzer reaches approximately 12000
execs/s.

The file format for the seed is a FilePair proto of a ZTF base file
and a patch file as used in Raw Apply. This reuses the same generator
and fuzzer as Raw Apply as the type of application is encoded in the
patch itself.

Bug: 835341
Change-Id: I00f28c768a6e1c7b8c5e95979b279d64785ef515
Reviewed-on: https://chromium-review.googlesource.com/1072231
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562260}
NOKEYCHECK=True
GitOrigin-RevId: 7206487ebd05fd4f30226ec59b730bb41c5013f2

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