Add support for APK Signature Scheme V3.1

This commit adds support for the V3.1 APK signature scheme; this
scheme allows an APK to target T+ for rotation without needing to
configure multi-targeting APKs. This scheme can be used by apps that
are impacted by any of the known issues with rotation on pre-T
releases. The v3.1 signature scheme uses a new block ID that is not
recognized by previous platforms, so earlier releases will use the
original signer in the v3.0 block, and T+ devices will use the
rotated signer in the v3.1 block. This scheme also supports SDK
version targeting allowing rotation to target a later release.

Bug: 192301300
Test: atest PkgInstallSignatureVerificationTest
Change-Id: I0b3345f0fd688aaaa1ef9f57d362d0fd0cb0565b