✨ Add PHPStan static analysis to Husky pre-commit hooks

[b-l-i-n-d]

🚀 Summary
This PR integrates PHPStan into our development workflow using Husky and lint-staged. Staged PHP files will now be automatically analyzed for logic errors and type mismatches before they can be committed to the repository.

🛠 Key Changes

• PHPStan Integration: Added phpstan, phpstan-wordpress, and the phpstan/extension-installer as development dependencies.
• Pre-commit Automation: Configured .lintstagedrc to execute phpstan analyze on staged PHP files.
• Resource Optimization: Included the --memory-limit=-1 flag in the pre-commit hook to prevent analysis failures on larger files or environments with restricted memory.
• Tooling Support: Although we aren't enforcing them in the pre-commit hook yet, I've also included phpcs and wpcs (WordPress Coding Standards) as dev-dependencies so they can be run manually by the team.

📦 How to update your local environment
Please run the following in both tutor and tutor-pro directories to initialize the new tools:

composer install
npm install

✅ Benefits

• Early Bug Detection: Catches potential issues like undefined variables, incorrect return types, and logic flaws before they reach the codebase.
• Performance: By using lint-staged, we only analyze the files currently being changed, keeping the hook fast and efficient.