[Feature Request] Able to align columns in bar graph

Hi, I have this simple grouped bar chart which gets centered by default

## Expected Behavior

## Current Behavior

## Possible Solution

I was wondering if I could be able to customize the position of the chart (like flex-start, justify-content or flex-end)

## Steps to Reproduce (for bugs)

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## Context

## Environment

* Chart.js version: "2.7.3"
* Browser name and version: Chrome