feat: add support for SDK banner

[Soare-Robert-Daniel]

Summary

Add SDK banner support.

Will affect visual aspect of the product

YES

Screenshots

Test instructions

Must be used with https://github.com/Codeinwp/themeisle-sdk/pull/269

• Set the instance date between 25 NOV and 3 DEC to trigger Black Friday banner
• You should see the banner on the Library page.
• You should NOT see the banner if it is not a Blackfriday Interval

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/themeisle/issues/1688

[pirate-bot]

Plugin build for e0e56de is ready 🛎️!

• Download PPOM - build 🔗

[HardeepAsrani]

All looks good but for testing you should also add details on how to change instance date.