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

[layershifter]

Fixes #1147.

Original PR #3980. All credits to @reefman001. Had to recreate due issues with Github CLI.

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This PR:

• adds a new subcomponent DropdownText to handle shorthands (nothing important actually)
• images and flags are now visible in single selection

• renderLabel in Dropdown has a new default value that allows to show images and flags in multiple variations

[github-actions]

size-limit report

Path	Size
bundle-size/dist/Button.size.js	70.84 KB (0%)
bundle-size/dist/Icon.size.js	33.41 KB (0%)
bundle-size/dist/Image.size.js	66.13 KB (0%)
bundle-size/dist/Portal.size.js	49.9 KB (0%)

[codecov-commenter]

Codecov Report

Merging #4003 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## master #4003 +/- ## ======================================= Coverage 99.84% 99.84% ======================================= Files 184 185 +1 Lines 3234 3245 +11 ======================================= + Hits 3229 3240 +11  Misses 5 5 

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

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