feat(Dropdown): add support for images, icons and flags in selected values

[knight-coder-llc]

Fixes #1147.

Updated drop down component icon not rendering with selection. #1147 fixed icon display with selected value from drop down menu.

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it across the finish line:

• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
• Run yarn test locally to catch errors. This ensures all components still behave as they should.
• Run yarn start to run the doc site locally and try a few pages, ensuring everything is in good working order.
• Include tests when adding/changing behavior.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[codecov-commenter]

Codecov Report

Merging #3980 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## master #3980 +/- ## ======================================= Coverage 99.84% 99.84% ======================================= Files 180 180 Lines 3169 3172 +3 ======================================= + Hits 3164 3167 +3  Misses 5 5 

Impacted Files	Coverage Δ
src/modules/Dropdown/Dropdown.js	100.00% <100.00%> (ø)

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[layershifter]

@reefman001 I used Github CLI to get your branch locally but it broke references to repositories:

So I can't push changes to your fork at all 💣 That's why I am closing this and opened #4003.