feat: improve go-to definition

[jjocoulter]

📝 PR Overview

• Fixed go-to definition functionality for methods with inner class parameters (e.g., MyClass.InnerClass)
• Implemented fuzzy parameter matching to handle both qualified and unqualified type names
• Replaced apex-ls dependency with custom workspace manager and symbol finder for better reliability
• Added caching for SFDX projects and class paths to improve performance
• Implemented quick pick UI when multiple files match a symbol

🧩 Type of change (check all applicable)

• 🐛 Bug fix - something not working as expected
• ✨ New feature – adds new functionality
• ♻️ Refactor - internal changes with no user impact
• ⚡ Performance Improvement
• 📝 Documentation - README or documentation site changes
• 🔧 Chore - dev tooling, CI, config
• 💥 Breaking change

🔗 Related Issues

fixes #
resolves #
closes #
related #

✅ Tests added?

• 👍 yes
• 🙅 no, not needed
• 🙋 no, I need help

📚 Docs updated?

• 🔖 README.md
• 🔖 CHANGELOG.md
• 📖 help site
• 🙅 not needed

Anything else we need to know? [optional]