Add SQL query patterns documentation and Linux package build scripts

- Created `TV_SHOWS_SQL_QUERY_PATTERNS.md` to document SQL query patterns for TV shows, including performance issues and missing indexes.
- Added `README.md` for Linux package building, detailing steps for creating Debian and Red Hat packages.
- Implemented build scripts for Debian and Red Hat, including service files and post-installation hooks.
- Added necessary scripts for managing Jellyfin service lifecycle on both Debian and Red Hat systems.
- Included package specifications and installation instructions for both distributions.

MediaBrowser.Controller/Library/ILibraryManager.cs

@@ -661,6 +661,8 @@ namespace MediaBrowser.Controller.Library
 
         ItemCounts GetItemCounts(InternalItemsQuery query);
 
+        Task<ItemCounts> GetItemCountsAsync(InternalItemsQuery query, CancellationToken cancellationToken = default);
+
         Task RunMetadataSavers(BaseItem item, ItemUpdateType updateReason);
 
         BaseItem GetParentItem(Guid? parentId, Guid? userId);