Folder Watching (#1467)

* Hooked in a server setting to enable/disable folder watching

* Validated the file rename change event

* Validated delete file works

* Tweaked some logic to determine if a change occurs on a folder or a file.

* Added a note for an upcoming branch

* Some minor changes in the loop that just shift where code runs.

* Implemented ScanFolder api

* Ensure we restart watchers when we modify a library folder.

* Fixed a unit test

API/DTOs/ScanFolderDto.cs

@@ -0,0 +1,17 @@
+namespace API.DTOs;
+
+/// <summary>
+/// DTO for requesting a folder to be scanned
+/// </summary>
+public class ScanFolderDto
+{
+    /// <summary>
+    /// Api key for a user with Admin permissions
+    /// </summary>
+    public string ApiKey { get; set; }
+    /// <summary>
+    /// Folder Path to Scan
+    /// </summary>
+    /// <remarks>JSON cannot accept /, so you may need to use // escaping on paths</remarks>
+    public string FolderPath { get; set; }
+}