Pull Request Overview

This PR expands the breaking changes documentation for v6 of the setup-go action, focusing on enhanced Go toolchain management capabilities and improved version resolution behavior. The documentation has been restructured for better clarity and includes practical code examples.

Key changes:

• Added comprehensive documentation for v6's enhanced Go toolchain management, including toolchain directive support and intelligent caching
• Restructured the README with better organization, including Quick Start, Breaking Changes, and Usage sections
• Updated all code examples to use modern Go versions (1.22, 1.23, 1.24) instead of outdated versions

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