Add php-cs-fixer with @PSR2 ruleset and additional rules for better readability along with automated file header copyright

[GhaziTriki]

This PR add php-cs-fixer with PSR-2 ruleset and some other rules for better readability. Copyright update bash script is also removed in favor of PHP-CS.

This PR also removed the @package in the docs in favour of namespace. Historically, the @package annotation was used more frequently in PHP frameworks and libraries that predate the widespread adoption of namespaces (introduced in PHP 5.3). It helped to logically group classes and interfaces together when namespace support was not available.