support AAB file output

[silbinarywolf]

Example of how to do that here:
https://developer.android.com/build/building-cmdline#bundletool-build
Web Archive: http://web.archive.org/web/20241005113630/https://developer.android.com/build/building-cmdline#bundletool-build

tldr:

• aapt2 link phase use protobuf format, ie. aapt2 link --proto-format --auto-add-overlay
• package zip file differently:
  • manifest/AndroidManifest.xml <- AndroidManifest.xml no longer in root
  • dex/... <- will need to move classes.dex to dex/classes.dex
  • res/... <- stays the same
  • root/..., assets/..., and lib/... <- stays the same
  • resources.pb <- likely generated as part of aapt2 link --proto-format
• pass zip to: bundletool build-bundle --modules=base.zip --output=mybundle.aab
• use jarsigner for AAB instead of apksigner (only used for .apk files)

How should we approach this?

• Make apk.installApk pass a flat to the internal function to say its an apk
• Create new apk.installAab to internally work differently. So we can still build APKs.
• Aesthetics (low priority)
  • Consider renaming apk.zig to just artifact.zig, so android.Apk becomes android.Artifact