Add plot lines or event lines,Add rangebar chart in Victory charts,Add grouped category x axis

**Is your feature request related to a problem? Please describe.**
I want to add event lines or plot lines in my line chart
Add rangebar chart in Victory charts,
Add grouped category x axis where 2 x axis values can shown where first ones will be a subgroup of second one

**Describe the solution you'd like**
I want to add event lines or plot lines in my line chart
Add rangebar chart in Victory charts,
Add grouped category x axis where 2 x axis values can shown where first ones will be a subgroup of second one

**Describe alternatives you've considered**
This is available in highcharts web inteface

**Additional context**
I want to add event lines or plot lines in my line chart
Add rangebar chart in Victory charts,
Add grouped category x axis where 2 x axis values can shown where first ones will be a subgroup of second one

The issue names no files, tests, or entry points; start by locating the existing Victory line-chart, range-bar, and axis APIs. Before implementation, clarify whether this is three separate features and define the expected behavior and acceptance criteria for each requested chart capability.

Written by the indexing model from the issue text.