refactor(VInput): convert to typescript

[johnleider]

Description

Convert VInput to typescript.

Motivation and Context

Starting baseline for converting other inputs

How Has This Been Tested?

jest

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)

[vercel]

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[codecov]

Codecov Report

Merging #5852 into dev will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             dev    #5852      +/-   ##
=========================================
+ Coverage   88.7%   88.73%   +0.03%     
=========================================
  Files        281      281              
  Lines       6161     6172      +11     
  Branches    1533     1540       +7     
=========================================
+ Hits        5465     5477      +12     
+ Misses       581      580       -1     
  Partials     115      115

Impacted Files	Coverage Δ
packages/vuetify/src/components/VInput/index.ts	100% <ø> (ø)
...uetify/src/components/VOverflowBtn/VOverflowBtn.js	94.59% <100%> (ø)	⬆️
...tify/src/components/VAutocomplete/VAutocomplete.js	98.16% <100%> (ø)	⬆️
packages/vuetify/src/mixins/validatable.ts	100% <100%> (ø)	⬆️
packages/vuetify/src/components/VSelect/VSelect.js	88.53% <100%> (ø)	⬆️
...kages/vuetify/src/components/VRadioGroup/VRadio.js	100% <100%> (ø)	⬆️
...uetify/src/components/VRangeSlider/VRangeSlider.js	100% <100%> (ø)	⬆️
.../vuetify/src/components/VRadioGroup/VRadioGroup.js	100% <100%> (ø)	⬆️
packages/vuetify/src/components/VSlider/VSlider.js	99.33% <100%> (ø)	⬆️
...ages/vuetify/src/components/VTextarea/VTextarea.js	93.93% <100%> (ø)	⬆️
... and 5 more

---

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[KaelWD]

This can be reverted after #5789

[johnleider]

So next year?

[lock]

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