feat(VSparkline): add fill property

[dsseng]

Description

#6022

Motivation and Context

#6022

How Has This Been Tested?

#6022

Markup:

#6022

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

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[codecov]

Codecov Report

Merging #6132 into dev will decrease coverage by 0.14%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             dev    #6132      +/-   ##
=========================================
- Coverage   82.1%   81.95%   -0.15%     
=========================================
  Files        290      290              
  Lines       6961     6973      +12     
  Branches    1712     1717       +5     
=========================================
  Hits        5715     5715              
- Misses      1126     1138      +12     
  Partials     120      120

Impacted Files	Coverage Δ
...es/vuetify/src/components/VSparkline/VSparkline.ts	5.05% <0%> (-0.51%)	⬇️
.../vuetify/src/components/VSparkline/helpers/path.ts	5.55% <0%> (-7.78%)	⬇️
...fy/src/components/transitions/expand-transition.js	76% <0%> (+4%)	⬆️

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