Tree widget

[samends]

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

Adds tree widget to widget project

Resolves #1214

[vercel]

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojowidgets/53wg9wgyx
✅ Preview: https://dojowidgets-git-fork-samends-treewidget.dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/esago0iu0
✅ Preview: https://widget-test-docs-git-fork-samends-treewidget.dojo1.vercel.app

[tomdye]

I think that this tree widget may also benefit from many aria properties.
https://www.w3.org/WAI/GL/wiki/Using_ARIA_trees gives some useful guidance on the topic.

[codecov]

Codecov Report

Merging #1516 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1516      +/-   ##
==========================================
- Coverage   91.10%   91.05%   -0.06%     
==========================================
  Files          89       92       +3     
  Lines        4398     4628     +230     
  Branches     1186     1247      +61     
==========================================
+ Hits         4007     4214     +207     
- Misses        192      197       +5     
- Partials      199      217      +18     

Impacted Files	Coverage Δ
src/tree/index.tsx	92.59% <ø> (ø)
src/tree/tests/unit/TreeData.mock.ts	100.00% <ø> (ø)
src/rate/index.tsx	83.58% <0.00%> (ø)

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