Adds circular loader

[samends]

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
• [x] For new widgets, an entry has been added to the .dojorc
• [x] For new widgets, theme.variant() is added to the root domnode
• [x] Any widget variant uses theme.compose like this
• [x] WidgetProperties are exported

Description: Adds circular loader to LoadingIndicator widget

Resolves #1584

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widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/EgWAHYJKsAYTwJC3Kh7osohJsdUV
✅ Preview: https://widget-test-docs-git-fork-samends-circular-loader-dojo1.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/3qgXf2ui4nAkmtBWUHukpa5ndu4v
✅ Preview: https://dojowidgets-git-fork-samends-circular-loader-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1706 (59026ab) into master (8bade73) will decrease coverage by 0.01%. The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master    #1706      +/-   ##
==========================================
- Coverage   90.05%   90.03%   -0.02%     
==========================================
  Files          94       94              
  Lines        5050     5060      +10     
  Branches     1373     1379       +6     
==========================================
+ Hits         4548     4556       +8     
- Misses        249      251       +2     
  Partials      253      253              

Impacted Files	Coverage Δ
src/loading-indicator/index.tsx	88.46% <81.25%> (-11.54%)	:arrow_down:
src/text-input/index.tsx	92.68% <0.00%> (-0.24%)	:arrow_down:
src/date-input/index.tsx	91.07% <0.00%> (ø)
src/time-picker/index.tsx	81.81% <0.00%> (ø)
src/password-input/index.tsx	78.57% <0.00%> (ø)
src/chip-typeahead/index.tsx	89.71% <0.00%> (+0.09%)	:arrow_up:
src/select/index.tsx	86.95% <0.00%> (+0.86%)	:arrow_up:

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[tomdye]

@samends Looks like you've addressed Ant's concerns but I believe it would benefit from having the different sizes examples added to the circular indicator example please.