feat: Add Multi Area Chart

[IlyesBenAmara]

Motivation

This PR adds a new chart : multi area chart for the React/Vue packages. I had to change the useToggableDomainKey hook so that it will sort the domain keys based on the max value of each key. The purpose of this is to draw the area with the maximum value first. We will need to add an opacity prop because we might hide a portion of the chart.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Checklist:

• [x] I have done the work for both React and Vue
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (Storybook)
• [x] I have added unit tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[marrouchi]

@IlyesBenAmara the color of the line should be same as it's area, right ?

[IlyesBenAmara]

• I removed the sorting of the areas, and added an opacity prop for the area.

[IlyesBenAmara]

I made some changes that were necessary because of the unit tests. One of them is the line color. I will bring the necessary changes once I start working on the Vue version :wink:

[IlyesBenAmara]

The unit tests do not go through as expected. I made the needed changes into another branch for the Vue version of the multi Area chart. So in order to repair the unit tests, we need to merge #88.

[marrouchi]

We need to add the chart to the list of exported charts in both react & vue.

I noticed a few issues :

• I addition when I toggle a legend item the opacity is updated to 1.
• In storybook, the multi-area is showing two areas while three are provided : domainKeys: ['yValue', 'yValue1', 'yValue2'],

[IlyesBenAmara]

@marrouchi I have addressed the issue of the provided domain Keys and the opacity. You can now review it again.