Add leading/trailing example for NumberInput

[aciccarello]

Type: feature

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: This adds a leading/trailing example for the number input widget.

Relates to #1578 which indicated a styling issue with the NumberInput

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widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/5S9MzJ8XyHXyggqnu1jztM8tkJsR
✅ Preview: https://widget-test-docs-git-fork-aciccarello-1578-number-leading-dojo1.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/Ej9rfF9JvwHvq3pk4H2jvRcKttGf
✅ Preview: https://dojowidgets-git-fork-aciccarello-1578-number-leading-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1671 (acd06da) into master (eeefd52) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1671   +/-   ##
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  Coverage   89.88%   89.88%           
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  Files          94       94           
  Lines        4963     4963           
  Branches     1342     1342           
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  Hits         4461     4461           
  Misses        248      248           
  Partials      254      254           

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[agubler]

Thanks @aciccarello, can you close the issue when you merge this too please?