Fixed Asset Bundles not working in Unity 6.

[Javialonqv]

This fixes Il2CppAssetBundleManager and Il2CppAssetBundle not working in Unity 6 by doing the following:

• Fixing the signatures for the delegates, since now Unity 6 icalls have the _Injected postfix.
• Adding extra delegates for functions where the parameters changed in Unity 6.
• Handling functions where the resulting pointer is actually a GCHandle and not the object itself (due to the new Unity 6 marshalling API).
• When loading an asset bundle, getting the actual bundle pointer by getting the objects' cachedPtr.
• Added AssetRipper.Primitives as a reference to Il2CppAssetBundleManager.csproj so we detect the Unity version that's being used, and then apply the changes depending of the version.

Tested in Unity Versions:

• 2022.3.62f2
• 6000.3.10f1