feat(datagrid): row skeleton loading

[valentin-mladenov]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: CDE-2609

What is the new behavior?

Datagrid row skeleton loaing added.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[github-actions]

👋 @valentin-mladenov,

• 🙏 The Clarity team thanks you for opening a pull request
• 🎉 The build for this PR has succeeded
• 🔍 The PR is now ready for review
• 🍿 In the meantime, view a preview of this PR
• 🖐 You can always follow up here. If you're a VMware employee, you can also reach us on our internal Clarity Support space

Thank you,

🤖 Clarity Release Bot

[github-actions]

This PR introduces visual changes: ea32966
If these changes are intended and correct, please cherry-pick the above commit to this PR.

git checkout datagrid-row-cell-skeleton-cde-2609
git fetch https://github.com/vmware-clarity/ng-clarity.git ea3296620493da97b8f3251df7b866cc7d43d9c3
git cherry-pick ea3296620493da97b8f3251df7b866cc7d43d9c3
git push