feat: add Skeleton

[SevereCloud]

• [x] Unit-тесты
• [x] e2e-тесты
• [ ] Дизайн-ревью
• [x] Документация фичи

Описание

Добавляем скелетон

[github-actions[bot]]

size-limit report 📦

Path	Size
JS	366.87 KB (+0.22% 🔺)
JS (gzip)	112.62 KB (+0.26% 🔺)
JS (brotli)	92.89 KB (+0.18% 🔺)
JS import Div (tree shaking)	1.42 KB (0%)
CSS	275.39 KB (+0.56% 🔺)
CSS (gzip)	35.9 KB (+0.84% 🔺)
CSS (brotli)	29.07 KB (+0.78% 🔺)

[codesandbox-ci[bot]]

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[github-actions[bot]]

e2e tests

Playwright Report

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 83.34%. Comparing base (2816293) to head (a4d3092).

Files	Patch %	Lines
packages/vkui/src/components/Skeleton/Skeleton.tsx	78.57%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5941      +/-   ##
==========================================
- Coverage   83.35%   83.34%   -0.01%     
==========================================
  Files         351      352       +1     
  Lines       10469    10483      +14     
  Branches     3475     3480       +5     
==========================================
+ Hits         8726     8737      +11     
- Misses       1743     1746       +3     

Flag	Coverage Δ
unittests	83.34% <78.57%> (-0.01%)	:arrow_down:

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[github-actions[bot]]

👀 Docs deployed

• ✅ Styleguide
• ✅ Storybook

Commit a4d309284d36906f66823de503fe64e89bef1fdc

[BlackySoul]

А мейби в дизайн наш это тоже унести?)

Вкусовщина, но вот эти белые проплешины меня прям триггерят 😄

https://github.com/VKCOM/VKUI/assets/7431217/65f925bb-f2e0-4d47-a28a-7e3e33090cb9

[vkcom-publisher]

✅ v6.1.0 🎉