feat: [REL-10723] implement a way to share overrides with others using urls

[pranjal-jately-ld]

Description

What does this PR do?

Implements URL-based state sharing for the LaunchDarkly toolbar, allowing users to share their complete toolbar configuration (flag overrides, contexts, settings, and starred flags) via a shareable link.

• Share State via URL: Users can click a share button to generate a URL containing their current toolbar state
• Selective Sharing: Popover UI allows users to choose which elements to include:
  • Flag overrides & starred flags
  • Contexts (including active context)
  • Settings (theme, position, etc.)
• Auto-Load on Init: Shared state automatically loads from URL when toolbar initializes
• Size Validation: Warns at 2KB, hard limit at 8KB to ensure URL compatibility
• Cross-Mode Support: Works in both SDK mode and dev-server mode

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation (changes to documentation only)
• 🔧 Refactor (code change that neither fixes a bug nor adds a feature)
• 🎨 Style (formatting, missing semicolons, etc; no production code change)
• ⚡ Performance (code change that improves performance)
• ✅ Test (adding missing tests, refactoring tests; no production code change)
• 🔨 Chore (updating grunt tasks, build process, etc; no production code change)

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Screenshots/Videos

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Related Jira issue: REL-10723: Implement a way to share overrides with others

[cspath1]

This is great and worked like a charm. I do have one general open question about the location of this. I'm wondering if Settings might make more sense for housing this functionality? What are your thoughts?