1655 - Typeahead / Select Placeholder

[KaneFreeman]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• 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
• Any widget variant uses theme.compose like this
• WidgetProperties are exported

Description:
Add placeholder input for typeahead and select, add default option when required is false

Resolves #1655

[vercel]

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widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/3XessanKdWC9EC1y6gi7LANtmpuQ
✅ Preview: https://widget-test-do-git-fork-kanefreeman-bugfix-select-typeah-369d97.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/ABmYkjdDGRxiV2MfL6TC5NngLBxn
✅ Preview: https://dojowidgets-git-fork-kanefreeman-bugfix-select-typeah-0d8289.vercel.app

[codecov]

Codecov Report

Merging #1718 (5c1bd28) into master (d543a3f) will increase coverage by 0.09%.
The diff coverage is 92.75%.

@@            Coverage Diff             @@
##           master    #1718      +/-   ##
==========================================
+ Coverage   90.43%   90.53%   +0.09%     
==========================================
  Files          94       94              
  Lines        5143     5175      +32     
  Branches     1403     1415      +12     
==========================================
+ Hits         4651     4685      +34     
+ Misses        241      237       -4     
- Partials      251      253       +2     

Impacted Files	Coverage Δ
src/typeahead/index.tsx	85.23% <88.88%> (+2.33%)	⬆️
src/select/index.tsx	88.54% <91.30%> (-0.25%)	⬇️
src/list/index.tsx	82.08% <100.00%> (+0.42%)	⬆️

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