feat: Add split APK support

[Aunali321]

Summary

Add split APK support to the library layer for applying patched resources, signing, and installing split APKs.

• Extract applyResources() and getSigner() helpers in ApkUtils
• Add PatchesResult.applyToSplits() for applying patched resources to split APKs
• Add signApks() for signing multiple APKs with a single signer instance
• Add splitFiles parameter to Installer.Apk (backward compatible, defaults to emptyMap())
• ADB: split install via pm install-multiple with push/cleanup
• Local: session writes each split alongside base
• Root: per-package mount directory, mount script handles all APKs from pm path
• Fix inverted null-check in RootInstaller.getInstallation
• Centralize splitFileName() in Constants
• Update ABI dumps

Test plan

• compileKotlinJvm passes
• Device install via adb install-multiple — success
• App launches and runs without crashes

Companion PRs:

• feat: Add auxiliary resource table loading for split APK support Apktool#3
• feat: Add split APK support revanced-patcher#408
• feat: Add split APK support revanced-cli#393