ARDK3: Crashes App with "Failed to load plugin. Plugin loading is only allowed on main thread."

Bug Reports
22

In my app, the following workaround seems to work with UaaL on iOS devices.
Please note that I don’t fully understand all the details, so use this at your own risk.

1. Disable plugin registration in RegisterPlugin.mm

// Runtime/Plugins/iOS/RegisterPlugin.mm
-(void)applicationDidFinishLaunching:(NSNotification*) notification
{
    NSLog(@"[Override_iOS applicationDidFinishLaunching:%@]", notification);
    // Do not register here.
    // UnityRegisterRenderingPluginV5(&UnityPluginLoad, &UnityPluginUnload);
}
@end

2. Add plugin loading function to LightshipARDK.m called from Unity.

// Runtime/Plugins/iOS/LightshipARDK.m
void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API LightshipARDK_LoadPluginFromUnity()
{
    NSLog(@"LightshipARDK_LoadPluginFromUnity");
    UnityRegisterRenderingPluginV5(&UnityPluginLoad, &UnityPluginUnload);
}

@interface LightshipARDK : NSObject

+ (void)loadPlugin;
...

3. Call LightshipARDK_LoadPluginFromUnity from Unity

Add LoadPluginFromUnity

// Runtime/Core/LightshipUnityContext.cs
public class LightshipUnityContext
{
    [DllImport("__Internal", EntryPoint = "LightshipARDK_LoadPluginFromUnity")]
    public static extern void LoadPluginFromUnity();

and call it from Initialize method.

    internal static void Initialize(bool isDeviceLidarSupported, bool disableTelemetry = false, string featureFlagFilePath = "")
    {
#if NIANTIC_LIGHTSHIP_AR_LOADER_ENABLED
        // load plugin on initialize
        Debug.Log("LoadPluginFromUnity start")
        LoadPluginFromUnity();
        Debug.Log("LoadPluginFromUnity end")
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