Support for react element as a label in Navigation Tab

[anmolmalik97new]

Summary

As of now, the Navigation component expects label as a string. But once we pass a react element. It works but at the same time, it throws a typescript error. As the component is expecting label to be a string.

Basic example

const navigationOptions = [ { name: 'todos', label: ( <TabLabel label="To-do's" count={todoCount} active={tab === 'todos'} /> ), link: `/test`, } ]

Motivation

To make it more generic

[aditya-kumawat]

This won't be allowed as per design guidelines. Support for count in Navigation will be added soon.

[satyamyadav]

This is resolved by #592 , so closing it.