Minor fix

[nanasess]

This pull request includes several changes aimed at improving code quality, consistency, and functionality. The most important changes include adding a new configuration file for PHP-CS-Fixer, updating dependencies, and making various code improvements across multiple files.

Configuration and Dependencies:

• Added a new PHP-CS-Fixer configuration file .php-cs-fixer.dist.php to enforce coding standards and rules.
• Updated composer.json to include friendsofphp/php-cs-fixer as a development dependency.

Code Improvements:

• Replaced count function calls with \count for better performance and consistency in src/Command/GenerateDummyDataCommand.php and tests/Fixture/Generator.php. [1] [2]
• Updated the constructor in GenerateDummyDataCommand to accept nullable strings.
• Added missing namespace references to various method calls in tests/Fixture/Generator.php. [1] [2]

Minor Fixes:

• Changed class_exists to class_exists in bootstrap.php for consistency.
• Added missing commas and corrected formatting in tests/Fixture/Generator.php. [1] [2]