refactor: replace XComponent props in favor of render callbacks

Making these props components makes it impossible pass additional props to them from the parent component. Render callbacks are more dynamic and flexible for this case

packages/stack/src/types.tsx

@@ -249,7 +249,6 @@ export type StackNavigationOptions = StackHeaderOptions &
     title?: string;
     /**
      * Function that given `HeaderProps` returns a React Element to display as a header.
-     * Setting to `null` hides header.
      */
     header?: (props: StackHeaderProps) => React.ReactNode;
     /**