feat: Add Min-Width Style Variables for Switch Component

[abdih]

Implementation of feature request from @LuisRodriguezLD

🤔 This is a ...

• New feature

🔗 Related issue link

close #20826

#20826

💡 Background and solution

Use less variable instead of a fixed constant for min-width of Switch component.

📝 Changelog

Language	Changelog
🇺🇸 English	Add variables to themes > default.less
🇨🇳 Chinese

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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Latest deployment of this branch, based on commit de54d26ecc60b5bc1c1a4d86b5680e5c2213fffd:

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[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 8c978aa:

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[codecov]

Codecov Report

Merging #20829 into feature will decrease coverage by 0.34%.
The diff coverage is 98.84%.

@@             Coverage Diff             @@
##           feature   #20829      +/-   ##
===========================================
- Coverage    97.81%   97.47%   -0.35%     
===========================================
  Files          286      296      +10     
  Lines         7737     6880     -857     
  Branches      2176     1911     -265     
===========================================
- Hits          7568     6706     -862     
- Misses         169      174       +5

Impacted Files	Coverage Δ
components/descriptions/index.tsx	98.92% <ø> (ø)	⬆️
components/config-provider/index.tsx	91.66% <ø> (-3.34%)	⬇️
components/date-picker/locale/fa_IR.tsx	100% <ø> (ø)	⬆️
components/anchor/AnchorLink.tsx	100% <ø> (ø)	⬆️
components/date-picker/locale/mk_MK.tsx	100% <ø> (ø)	⬆️
components/date-picker/locale/hu_HU.tsx	100% <ø> (ø)	⬆️
components/date-picker/locale/mn_MN.tsx	100% <ø> (ø)	⬆️
components/date-picker/locale/sl_SI.tsx	100% <ø> (ø)	⬆️
components/date-picker/locale/pt_PT.tsx	100% <ø> (ø)	⬆️
components/date-picker/locale/et_EE.tsx	100% <ø> (ø)	⬆️
... and 203 more

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