Adds Node.js compatible util.getSystemErrorMap() function that returns a Map of system error codes to [name, message] tuples.
- Added getSystemErrorMap function in node_util_binding.zig with all system error codes
- Exposed getSystemErrorMap through the util module
- Added comprehensive tests to verify correctness
- Verified compatibility with existing getSystemErrorName tests
Fixes#22872🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
