Simplify Folder Watcher (#1484)

* Refactored Library Watcher to use Hangfire under the hood.

* Support .kavitaignore at root level.

* Refactored a lot of the library watching code to process faster and handle when FileSystemWatcher runs out of internal buffer space. It's still not perfect, but good enough for basic use.

* Make folder watching as experimental and default it to off by default.

* Revert #1479

* Tweaked the messaging for OPDS to remove a note about download role.

Moved some code closer to where it's used.

* Cleaned up how the events widget reports

* Fixed a null issue when deleting series in the UI

* Cleaned up some debug code

* Added more information for when we skip a scan

* Cleaned up some logging messages in CoverGen tasks

* More log message tweaks

* Added some debug to help identify a rare issue

* Fixed a bug where save bookmarks as webp could get reset to false when saving other server settings

* Updated some documentation on library watcher.

* Make LibraryWatcher fire every 5 mins

API/Data/Seed.cs

@@ -103,7 +103,7 @@ namespace API.Data
                 new() {Key = ServerSettingKey.ConvertBookmarkToWebP, Value = "false"},
                 new() {Key = ServerSettingKey.EnableSwaggerUi, Value = "false"},
                 new() {Key = ServerSettingKey.TotalBackups, Value = "30"},
-                new() {Key = ServerSettingKey.EnableFolderWatching, Value = "true"},
+                new() {Key = ServerSettingKey.EnableFolderWatching, Value = "false"},
             }.ToArray());
 
             foreach (var defaultSetting in DefaultSettings)