feat(progress): support linear gradient color when mode is circle

[chouchouji]

Checklist

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• Fix linting errors
• Tests have been added / updated (or snapshots)

Change information

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Issues

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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varlet-ui-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2023 3:32pm

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (499cd46) 92.99% compared to head (e7d2fa3) 93.03%.
Report is 22 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1180      +/-   ##
==========================================
+ Coverage   92.99%   93.03%   +0.03%     
==========================================
  Files         284      284              
  Lines        6226     6256      +30     
  Branches     1508     1520      +12     
==========================================
+ Hits         5790     5820      +30     
  Misses        373      373              
  Partials       63       63              

Files Changed	Coverage Δ
packages/varlet-ui/src/progress/props.ts	100.00% <ø> (ø)
packages/varlet-ui/src/progress/Progress.vue	97.22% <100.00%> (+1.57%)	⬆️

... and 2 files with indirect coverage changes

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