aapt2: (De-)Serialize minor version in config

Bug: 383177182
Test: atest aapt2_tests
Test: Build + boot on Pixel 6 Pro
Test: Manually built APK with minor version in resource config. Verified
the output in aapt2 dump resources/chunks.
Flag: EXEMPT used in host tool (aapt2)

Change-Id: I5bd1d3970493cc47961fe44cfa9fd214a5836551