Convert src/SecurityManager.js to TypeScript

This includes a few small API tweaks as well, only in cases where TS revealed we
were doing something confusing or wrong.

Part of https://github.com/vector-im/element-web/issues/15350

src/Modal.tsx

@@ -132,7 +132,7 @@ export class ModalManager {
     public createTrackedDialogAsync<T extends any[]>(
         analyticsAction: string,
         analyticsInfo: string,
-        ...rest: Parameters<ModalManager["appendDialogAsync"]>
+        ...rest: Parameters<ModalManager["createDialogAsync"]>
     ) {
         Analytics.trackEvent('Modal', analyticsAction, analyticsInfo);
         return this.createDialogAsync<T>(...rest);