feat: select file set startAccessingSecurityScopedResource

Author: nashaofu

plugins/dialog/ios/Sources/DialogPlugin.swift

@@ -157,6 +157,7 @@ class DialogPlugin: Plugin {
     onFilePickerResult = { (event: FilePickerEvent) -> Void in
       switch event {
       case .selected(let urls):
+         urls.first?.startAccessingSecurityScopedResource()
         invoke.resolve(["file": urls.first!])
       case .cancelled:
         invoke.resolve(["file": nil])