fix: return result of android dialog dismissal to JS (#636)

Author: vonovak

src/DateTimePickerAndroid.android.js

@@ -98,9 +98,9 @@ function open(props: AndroidNativeProps) {
   presentPicker();
 }
 
-function dismiss(mode: AndroidNativeProps['mode']) {
+function dismiss(mode: AndroidNativeProps['mode']): Promise<boolean> {
   // $FlowFixMe - `AbstractComponent` [1] is not an instance type.
-  pickers[mode].dismiss();
+  return pickers[mode].dismiss();
 }
 
 export const DateTimePickerAndroid = {open, dismiss};

src/index.d.ts

@@ -193,7 +193,7 @@ export type WindowsNativeProps = Readonly<
 
 declare namespace DateTimePickerAndroidType {
   const open: (args: AndroidNativeProps) => void;
-  const dismiss: (mode: AndroidNativeProps['mode']) => void;
+  const dismiss: (mode: AndroidNativeProps['mode']) => Promise<boolean>;
 }
 
 declare const RNDateTimePicker: FC<