fix: add missing type declarations (#704)

Author: fobos531

typings/index.d.ts

@@ -160,6 +160,12 @@ export interface DateTimePickerProps {
    */
   pickerContainerStyleIOS?: ViewStyle;
 
+  /**
+   * The style applied to the actual picker component - this can be
+   * either a native iOS picker or a custom one if `customPickerIOS` was provided
+   */
+  pickerComponentStyleIOS?: ViewStyle;
+
   /**
    * Initial selected date/time
    *