Implement Device Cache to replace EFCoreSecondLevelCacheInterceptor

The EFCoreSecondLevelCacheInterceptor will place a huge lock even for reading. Implement a ConcurrentDictionary cache to replace it.

Signed-off-by: gnattu <gnattuoc@me.com>

Jellyfin.Server.Implementations/Users/DeviceAccessHost.cs

@@ -60,10 +60,10 @@ public sealed class DeviceAccessHost : IHostedService
 
     private async Task UpdateDeviceAccess(User user)
     {
-        var existing = (await _deviceManager.GetDevices(new DeviceQuery
+        var existing = _deviceManager.GetDevices(new DeviceQuery
         {
             UserId = user.Id
-        }).ConfigureAwait(false)).Items;
+        }).Items;
 
         foreach (var device in existing)
         {