Support AGP 9 example compatibility

[nohli]

Summary

• declare Kotlin Gradle Plugin 2.2.20 for the example fallback path
• apply Kotlin plugins only when the host does not use AGP 9 built-in Kotlin
• keep plugin Gradle configuration compatible with older supported Flutter hosts
• bump the package to 0.5.2+2

Validation

• fresh consumer builds on every installed supported Flutter line from 3.10.6 through 3.44.6
• integration tests on Android API 24, 31, 35, 36, and 37
• AGP 9 legacy and built-in Kotlin paths
• Flutter analysis and unit tests

[Copilot]

Pull request overview

Updates the plugin’s Android/Gradle setup and the example app to remain compatible across Flutter hosts ranging from legacy AGP/Kotlin setups through AGP 9’s built-in Kotlin support, and bumps the package patch version accordingly.

Changes:

• Bump package version to 0.5.2+2 (and update the example lockfile and changelog).
• Example: declare Kotlin Gradle Plugin 2.2.20 and conditionally apply Kotlin based on AGP 9 built-in Kotlin behavior.
• Plugin Android build: add Flutter-extension fallbacks for compileSdk/minSdk and adjust Kotlin JVM target configuration paths.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pubspec.yaml	Bumps package version to 0.5.2+2.
example/pubspec.lock	Updates example’s path dependency version to match the package bump.
example/android/settings.gradle	Declares KGP 2.2.20 in plugin management for the example project.
example/android/app/build.gradle	Adds AGP/built-in Kotlin detection and conditionally applies Kotlin/Flutter Gradle plugins.
android/build.gradle	Adds flutter extension fallbacks and adjusts Kotlin JVM target configuration by Kotlin path.
CHANGELOG.md	Documents the 0.5.2+2 changes.

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