Adds LibraryThing to the Social Icon block

[dhruvikpatel18]

Resolves: #61779

What?

Add LibraryThing to the social media icons block, allowing users to link to their LibraryThing profiles.

Why?

This PR addresses the need for LibraryThing integration in the social icons block. LibraryThing is a popular social cataloging platform for book lovers, and adding this icon will allow users to link to their LibraryThing profiles alongside other social media links.

How?

• Added LibraryThing icon SVG to the social media icons collection
• Added LibraryThing to the supported services list
• Implemented the icon following Gutenberg's social icon design patterns

Testing Instructions

1. Open the editor and create a new post/page
2. Add a Social Icons block
3. Click the "+" button to add a new social link
4. Search for "LibraryThing" in the icon picker
5. Verify the LibraryThing icon appears and matches the design of other social icons
6. Add your LibraryThing profile URL
7. Verify the link works correctly in both editor and preview

Screenshots or screencast

LibraryThing.Screencast.mov

[github-actions]

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[github-actions]

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[Mamaduka]

Closing in favor of #70261. The extensibility feature will ship in WP 6.9 and is already available in Gutenberg 21.1.