Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/FileAPI/FileList.idl

@@ -0,0 +1,8 @@
+#import <FileAPI/File.idl>
+
+// https://w3c.github.io/FileAPI/#filelist-section
+[Exposed=(Window,Worker), Serializable]
+interface FileList {
+    getter File? item(unsigned long index);
+    readonly attribute unsigned long length;
+};