Android: opt-in flag for bsdiff patches

[ofalvai]

It's probably a good idea to make #42 an opt-in behavior, at least initially.

[Copilot]

Pull request overview

Adds opt-in Android support for applying bsdiff patches during CodePush differential updates.

Changes:

• Adds v2 diff-manifest parsing, SHA-256 validation, safe path resolution, and binary patch application.
• Introduces the CodePushEnableBinaryDiffUpdates Android resource flag.
• Adds unit tests, fixtures, and documentation.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/api-android.md	Documents the opt-in flag.
android/app/build.gradle	Adds JSON test dependency.
android/app/src/main/java/com/microsoft/codepush/react/CodePush.java	Reads the resource flag.
android/app/src/main/java/com/microsoft/codepush/react/CodePushConstants.java	Defines the patch directory.
android/app/src/main/java/com/microsoft/codepush/react/CodePushUpdateManager.java	Integrates v2 patch handling.
android/app/src/main/java/com/microsoft/codepush/react/CodePushUpdateUtils.java	Uses parsed manifests and shared hashing.
android/app/src/main/java/com/microsoft/codepush/react/diffpatch/BinaryDiffPatcher.kt	Validates and applies patches.
android/app/src/main/java/com/microsoft/codepush/react/diffpatch/DiffManifest.kt	Parses diff manifests.
android/app/src/main/java/com/microsoft/codepush/react/diffpatch/DiffPatch.kt	Adds an injectable patch interface.
android/app/src/main/java/com/microsoft/codepush/react/diffpatch/Sha256.kt	Implements SHA-256 helpers.
android/app/src/test/java/com/microsoft/codepush/react/diffpatch/BinaryDiffPatcherTest.kt	Tests patching behavior and safety.
android/app/src/test/java/com/microsoft/codepush/react/diffpatch/DiffManifestTest.kt	Tests manifest parsing.
android/app/src/test/java/com/microsoft/codepush/react/diffpatch/Sha256Test.kt	Tests hashing behavior.
android/app/src/test/resources/binarydiff/basic/old.dat	Provides the source fixture.
android/app/src/test/resources/binarydiff/basic/new.dat	Provides the expected fixture.
android/app/src/test/resources/binarydiff/basic/patch.bsdiff	Provides the binary patch fixture.

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