Add ARCoreExtensions for ARCloudAnchor support

Assets/ExtensionsAssets.meta

Assets/ExtensionsAssets/Runtime.meta

Assets/ExtensionsAssets/Runtime/RuntimeConfig.asset

Assets/ExtensionsAssets/Runtime/RuntimeConfig.asset.meta

Assets/Plugins.meta

Assets/Plugins/Android.meta

Assets/Plugins/Android/gradleTemplate.properties

Assets/Plugins/Android/gradleTemplate.properties.meta

Assets/Plugins/Android/mainTemplate.gradle

Assets/Plugins/Android/mainTemplate.gradle.meta

Assets/Plugins/Android/proguard-user.txt

Assets/Plugins/Android/proguard-user.txt.meta

Assets/Plugins/Android/settingsTemplate.gradle

Assets/Plugins/Android/settingsTemplate.gradle.meta

Assets/Scenes/ExampleGLTF.unity

Packages/manifest.json

Packages/packages-lock.json

Packages/unity-world-analysis-arfoundation-wrapper-package

ProjectSettings/ARCoreExtensionsProjectSettings.json

ProjectSettings/GvhProjectSettings.xml