Incremental patch support

[inthewaves]

Will be helpful for reducing download size.

References:

• https://android-developers.googleblog.com/2016/12/saving-data-reducing-the-size-of-app-updates-by-65-percent.html?m=1
• https://github.com/google/archive-patcher

[thestinger]

Some work has likely been done on this already internally.

[inthewaves]

Would love to see what's been done and continue it if possible. I investigated this a long time ago:

• Fork to build a JAR to use as a library: https://github.com/inthewaves/archive-patcher
• Applying inside of an app: https://github.com/inthewaves/ArchivePatcherTester/blob/383ef743c90f4e8caf437dc85cf34230659ceb27/app/src/main/java/com/example/archivepatchertester/MainActivity.kt#L76
• Generation of deltas: https://github.com/inthewaves/AppUpdateServerGenerator/blob/main/src/main/kotlin/org/grapheneos/appupdateservergenerator/util/ArchivePatcherUtil.kt