Update dependencies and add visibility toggling and layout-based scale resizing to the glTF

[fuentespatrick]

• Update dependencies
• Update the compileSDK & targetSDK to the latest
• Include a compile-only dependency on the XR extensions to allow for Proguard minification
• Add the ability to toggle the visibility of the bugdroid glTF
• Scale the size of the bugdroid glTF when the associated panel is resized

Fixes #12

[gemini-code-assist]

Summary of Changes

Hello @fuentespatrick, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the project's dependencies and enhancing the glTF model's interactive capabilities. Key changes include upgrading the Android SDK versions and various libraries to their latest, introducing the ability to toggle the visibility of the Bugdroid glTF model, and implementing dynamic resizing of the glTF model based on its containing UI panel. These updates aim to improve application stability, leverage newer platform features, and provide a more responsive user experience, while also fixing issue #12.

Highlights

• Dependency and SDK Version Updates: The project's compileSdk and targetSdk have been upgraded to version 36, ensuring compatibility with the latest Android features and behaviors. Additionally, various other dependencies, including Android Gradle Plugin, AndroidX XR libraries, and Kotlin, have been updated to their latest stable versions.
• Bugdroid glTF Visibility Toggling: A new feature has been implemented that allows users to toggle the visibility of the Bugdroid glTF model within the application. This is controlled via a button that dynamically changes its text based on the model's current visibility state.
• Layout-Based glTF Model Resizing: The Bugdroid glTF model now dynamically scales its size based on the dimensions of its associated UI panel. This ensures the model maintains an appropriate visual presence regardless of layout changes, leveraging new SceneCoreEntity and SceneCoreEntitySizeAdapter components.
• XR Environment and glTF Rendering Refactor: Significant refactoring has occurred in how XR environment settings are managed and how glTF models are loaded and rendered. This includes updating API calls for spatial environment modes and adopting a new caching mechanism for glTF models to improve performance and resource management.

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[gemini-code-assist]

Code Review

This pull request successfully updates various dependencies and introduces new functionality for toggling the visibility and dynamically scaling the bugdroid glTF model. The implementation of a cache for the glTF model is a great addition for performance. However, I've identified a critical type mismatch and a high-severity thread-safety issue in the new BugdroidModel.kt file that should be addressed to ensure correctness and robustness.