Concurrency issues with EF Core

[magnusj64]

The main issue I have been having with QuickGrid is that it makes concurrent calls to EF Core when you use Virtualization and larger datasets (>~1000 records). I also have two minor changes. First I need an OnRefresh delegate and secondly I proposed a solution to the ToDo comment about the Debounce function.

Added a SemaphoreSlim to make sure we don't make concurrent requests to EF Core. Added an OnRefresh delegate.
Added a SmartConfigurableDebounce function.

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