ESLint GitHub Actions Formatter

ESLint formatter (v2.0.1) that generates GitHub Actions annotations for linting errors and warnings, enabling inline code annotations in pull request diffs and checks. When run outside a GitHub Actions environment, it falls back to ESLint's built-in stylish formatter. Optionally outputs JSON for SonarCloud integration. Includes TypeScript type definitions. Compatible with ESLint 8 and 9 (flat config).