feat(VSwitch): add loading prop

[KaelWD]

Motivation and Context

https://storage.googleapis.com/spec-host-backup/mio-design%2Fassets%2F13vdLWUJ-zpgHVaYc2Mwddd5oY9ElA-Uq%2Fslidercontrols-1b-v02.mp4

How Has This Been Tested?

Markup:

<template>
  <v-app>
    <v-container>
      <v-switch v-model="loading" label="loading"></v-switch>
      <v-switch :loading="loading"></v-switch>
      <v-switch :loading="loading" color="green"></v-switch>
      <v-switch :loading="loading && 'green'" :color="loading ? 'white' : 'green'"></v-switch>
      <v-text-field :loading="loading"></v-text-field>
      <v-slider :loading="loading"></v-slider>
    </v-container>
  </v-app>
</template>

<script>
  export default {
    data: () => ({
      loading: false
    })
  }
</script>

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)

[codecov]

Codecov Report

Merging #4805 into dev will decrease coverage by 0.56%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #4805      +/-   ##
==========================================
- Coverage   89.41%   88.84%   -0.57%     
==========================================
  Files         244      231      -13     
  Lines        5770     5443     -327     
  Branches     1438     1394      -44     
==========================================
- Hits         5159     4836     -323     
+ Misses        486      483       -3     
+ Partials      125      124       -1

Impacted Files	Coverage Δ
src/components/VInput/VInput.js	93.84% <ø> (-0.1%)	⬇️
src/components/VSlider/VSlider.js	99.33% <100%> (ø)	⬆️
src/components/VTextField/VTextField.js	94.11% <100%> (+0.04%)	⬆️
src/components/VSwitch/VSwitch.js	88.23% <100%> (+2.52%)	⬆️
src/components/VBtnToggle/VBtnToggle.ts	80.55% <0%> (-19.45%)	⬇️
src/mixins/button-group.ts	85.18% <0%> (-14.82%)	⬇️
src/components/VMenu/mixins/menu-keyable.js	86.36% <0%> (-4.55%)	⬇️
src/components/VBottomNav/VBottomNav.ts	88.88% <0%> (-4.45%)	⬇️
.../components/VNavigationDrawer/VNavigationDrawer.js	67.03% <0%> (-1.1%)	⬇️
src/mixins/applicationable.ts	90% <0%> (-0.48%)	⬇️
... and 60 more

---

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