Packages versions were not aligned to the unity version. This has been fixed by downgrading the Unity version to 2021.3 LTS, and removing the AR default package (replaced by multiple smaller packages instead)
Added a XR scene for testing anchoring scenario
Some projects settings were not aligned with android deployment (Graphics API hasbeen set to OpenGL instead of auto, IL2CPP for code generation instead of Mono, and target architecture set to arm64 instead of armv7)
This PR fix those identified problems: