Generate brotli compressed {}.new.dat for full OTA

Brotli has a better compression ratio than deflation. So for non-AB
full OTA, we can compress the new.dat with brotli first and store it
in the zip package.
This increase the OTA generation time by ~5 minutes for a full OTA
(measured based on 2.0G system.new.dat)

Bug: 34220646
Test: Generate a full OTA for bullhead
Change-Id: I9c0550af8eafcfa68711f74290c8e2d05a96648f