feat: add .gitignore option

[coliff]

This pull request introduces a new feature to the vscode-htmlhint extension, allowing users to skip linting files ignored by .gitignore. It also includes updates to handle .gitignore files, improve diagnostics, and update dependencies. Below is a summary of the most important changes:

New Feature: .gitignore Integration

• Added a new configuration option htmlhint.ignoreGitignore to skip linting files ignored by .gitignore. This feature can be enabled in VS Code settings. [1] [2] [3] [4]
• Implemented logic to parse .gitignore files and determine whether files should be ignored during validation. This includes caching for performance and clearing the cache when settings or .gitignore files change. [1] [2] [3] [4] [5]

Diagnostics and Debugging Enhancements

• Added debug logging for code actions and .gitignore-related operations to improve traceability. [1] [2]
• Updated validation logic to clear diagnostics for ignored files, ensuring no unnecessary warnings are displayed.

Dependency and Configuration Updates

• Updated package.json and package-lock.json to include the ignore library for .gitignore handling. [1] [2]
• Bumped the extension version to 1.11.0 and updated the changelog to document the new feature. [1] [2]

File Watcher Enhancements

• Added a file system watcher for .gitignore files to trigger revalidation when they are modified. [1] [2]

General Codebase Improvements

• Updated .cursor/rules/general.mdc with guidelines for maintaining alphabetical order in rules, attributes, and lists.