improve native android cache clearing

[richardelms]

This pull request refactors and extends the cache-clearing logic in Main.cs for the Maze Runner Unity app. The main focus is on improving platform-specific cache clearing, especially for Android and iOS, and making the code more modular and maintainable.

Cache clearing improvements:

• Refactored the generic ClearUnityCache method into a new ClearCache method that delegates to platform-specific cache clearing functions (ClearUnityCache, ClearAndroidCache, ClearIOSCache), improving clarity and maintainability. ([features/fixtures/maze_runner/Assets/Scripts/Main.csL156-R330](https://github.com/bugsnag/bugsnag-unity/pull/947/files#diff-de9904b5ccc03c4a50ec009435ca97d7ec0aa87d63812badfa9a0d27659e77d1L156-R330))
• Added comprehensive Android cache clearing: deletes specific directories and files, clears shared preferences, and logs folder contents for debugging. Introduced helper methods for file/directory deletion and folder listing, and used Unity's AndroidJava APIs to find cache and files roots. ([features/fixtures/maze_runner/Assets/Scripts/Main.csL156-R330](https://github.com/bugsnag/bugsnag-unity/pull/947/files#diff-de9904b5ccc03c4a50ec009435ca97d7ec0aa87d63812badfa9a0d27659e77d1L156-R330))
• Renamed ClearIOSData to ClearIOSCache for consistency with other platform-specific methods. ([features/fixtures/maze_runner/Assets/Scripts/Main.csL156-R330](https://github.com/bugsnag/bugsnag-unity/pull/947/files#diff-de9904b5ccc03c4a50ec009435ca97d7ec0aa87d63812badfa9a0d27659e77d1L156-R330))

Codebase cleanup and consistency:

• Updated the command handler to call the new ClearCache method instead of the old ClearUnityCache method, ensuring that platform-specific logic is used. ([features/fixtures/maze_runner/Assets/Scripts/Main.csL135-R133](https://github.com/bugsnag/bugsnag-unity/pull/947/files#diff-de9904b5ccc03c4a50ec009435ca97d7ec0aa87d63812badfa9a0d27659e77d1L135-R133))
• Removed minor blank lines and improved method organization for readability. ([features/fixtures/maze_runner/Assets/Scripts/Main.csL46-L48](https://github.com/bugsnag/bugsnag-unity/pull/947/files#diff-de9904b5ccc03c4a50ec009435ca97d7ec0aa87d63812badfa9a0d27659e77d1L46-L48))

[bugsnagbot]

Build size impact

Format	Size impact of Bugsnag (kB)
IL2CPP APK	2626.5
IL2CPP IPA	1753.88

Generated by 🚫 Danger