feat: wizard content configuration

[bitpshr]

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:

This pull request adds custom content support to Wizard step configuration.

Resolves #1611

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/F3XmwGMpi62yXxzvXqxoG9sAfyet
✅ Preview: https://dojowidgets-git-fork-bitpshr-feat-wizard-content-dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/FnsM9CuwJEbA3TTQW1EWQEXumD5Z
✅ Preview: https://widget-test-docs-git-fork-bitpshr-feat-wizard-content-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1719 (6ace6df) into master (afc67b0) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1719      +/-   ##
==========================================
+ Coverage   90.17%   90.24%   +0.06%     
==========================================
  Files          94       94              
  Lines        5088     5114      +26     
  Branches     1384     1390       +6     
==========================================
+ Hits         4588     4615      +27     
+ Misses        247      246       -1     
  Partials      253      253              

Impacted Files	Coverage Δ
src/wizard/index.tsx	92.30% <100.00%> (+0.47%)	:arrow_up:
src/date-input/date-utils.tsx	97.43% <0.00%> (-2.57%)	:arrow_down:
src/date-input/index.tsx	91.37% <0.00%> (+0.30%)	:arrow_up:
src/time-picker/index.tsx	82.22% <0.00%> (+0.40%)	:arrow_up:
src/select/index.tsx	88.79% <0.00%> (+1.83%)	:arrow_up:

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