feat: Added new control LegendDisplayable

[christophka]

Summary

Please describe your changes.

Checklist

Please ensure that you've fulfilled the following tasks:

• [x] My code follows the style guides of this project and yarn lint does not throw errors
• [x] My code is well tested and did not decrease the test coverage
• [x] All new and existing tests have passed
• [x] My submission passes the build
• [x] I've added changes to CHANGELOG.MD
• [ ] I've updated the project documentation

[coveralls]

Pull Request Test Coverage Report for Build 90

• 30 of 30 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 87:	0.0%
Covered Lines:	228
Relevant Lines:	228

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💛 - Coveralls