Icon support

[Jukez17]

Describe the Feature

The masked input field could have similar support for left and right icons like the react native elements input field has.

Possible Implementations

Adding a leftIcon and rightIcon props to the masked text input

Related Issues

[akinncar]

The purpose of this library is to provide support to mask texts without any styles because styles can be easily resolved outside the library. I think that adds a wrapper to add styles will limit the styling inside the library causing possible problems.