1565 - Add typeahead dropdown icon/button

[KaneFreeman]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit tests are included in the PR
• [ ] For new widgets, an entry has been added to the .dojorc
• [ ] For new widgets, theme.variant() is added to the root domnode
• [x] Any widget variant uses theme.compose like this
• [ ] WidgetProperties are exported

Description: Add typeahead dropdown icon/button

Resolves #1565

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/6NGGzjUkWS36h8swiA7Uh2bDYgGN
✅ Preview: https://dojowidgets-git-fork-kanefreeman-feature-typeahead-se-1004d2.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/BznWtFVvGuBVNeBGXqF3bTjRaTgM
✅ Preview: https://widget-test-do-git-fork-kanefreeman-feature-typeahead-se-337887.vercel.app

[codecov[bot]]

Codecov Report

Merging #1735 (21d73ac) into master (23b69c3) will increase coverage by 0.06%. The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master    #1735      +/-   ##
==========================================
+ Coverage   90.36%   90.43%   +0.06%     
==========================================
  Files          94       94              
  Lines        5129     5143      +14     
  Branches     1398     1403       +5     
==========================================
+ Hits         4635     4651      +16     
+ Misses        243      241       -2     
  Partials      251      251              

Impacted Files	Coverage Δ
src/typeahead/index.tsx	82.89% <93.75%> (+2.05%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 23b69c3...21d73ac. Read the comment docs.