Implement VeeSkeletonLoader component

[andreadelfante]

Is your feature request related to a problem? Please describe.
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Describe the solution you'd like
We need to implement VeeSkeletonLoader component to represent a skeleton loader.

Describe alternatives you've considered
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Additional context
Please follow the documentation: https://v2.vuetifyjs.com/en/components/skeleton-loaders/ and https://v2.vuetifyjs.com/en/api/v-skeleton-loader/