Adding index builder

[GustC]

Description

This PR has created to add new parameter to AzListView called indexBuilder.

The AzListView.indexBuilder is as simple builder, used to customize the index itens in indexBar. This paramenter is optional.

Motivation

The AzListView contains the indexBarData can be used to change the index list, but cannot change the render of index elements. Now you can create the custom render for you indexBarData.