Added app builder configuration for "show legend" to toggle display o…

[psuslick]

…f chart legend

To address concerns which were raised in issue #39 (#39) this feature adds an ability for the app builder to toggle display of the legend on or off.

Description

To address concerns which were raised in issue #39 (#39) this feature adds an ability for the app builder to toggle display of the legend on or off.

Motivation and Context

End users were met with undesirable and unintended charts displays when attempting to utilize the app builder component with SOQL statements.

This change allows for charts made using the app builder to hide the legend when the query returns it as "undefined."

#39

How Has This Been Tested?

The feature has been shown to work across multiple scratch orgs and app builder configurations.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[scolladon]

issue(test): improve test for the new attribute

We should add a dedicated jest test in __tests__/unit/chartBuilder.test.js for the newly created attribute