feat: add shadow pluse button animation

[Divika-23]

Pull Request Template

Description

This PR adds a new Shadow Pulse Button animation component to AnimateHub.

##What was added
-New Shadow Pulse Button animation component
-Integrated into Buttons snippets section
-Available under Explore ->Buttons
-Live preview works correctly

##Testing
-Tested locally using 'npm run dev'
-verified animation renders and behaves as expected

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

Please mention these details about yourself here.

1. Contributor Name : Divika Thota
2. Contributor Email ID : divikathota@gmail.com
3. Contributor Github Link :https://github.com/Divika-23

regards,

Prem Kolte.

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[github-actions]

✨ Hi @Divika-23! Thanks for submitting another pull request. Your continuous improvements are highly valued. Keep contributing! 🙌

[Divika-23]

Hi Thanks for reviewing my PR! I noticed the Vercel check requires authorization. Please let me know if there's anything needed from my side. Happy to make any changes if required.