feat: add option to preload fonts

[HardeepAsrani]

Summary

This pull request adds a new feature to the Neve theme that allows users to preload Google Fonts for improved performance, alongside existing local font hosting options. The changes introduce a new Customizer toggle for font preloading, update theme configuration and settings, and implement logic to modify font stylesheet loading behavior.

Will affect visual aspect of the product

No

Screenshots

Test instructions

• Make sure you see the option in Customizer > Typography
• The fonts in the front respect the behavior for fonts set in Customzier.

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/neve-pro-addon/issues/3060.

[pirate-bot]

Plugin build for 9577762 is ready 🛎️!

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[pirate-bot]

🌍 i18n String Review Report

📊 Summary

Category	Count
➕ Added	1
➖ Removed	0
🔄 Changed	0
Total	1

➕ Added Strings (1) - Click to expand

String	Location	Words	Suggested Match
Preload fonts	neve/assets/apps/customizer...	2	No close match
Total		2

[pirate-bot]

🎉 This PR is included in version 4.2.0 🎉

The release is available on GitHub release

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