Add version specification for PHARs

[eduardocruz]

PHPX should support version specification for PHARs, similar to how we handle Composer packages.

Requirements

• Support syntax like phpx php-cs-fixer.phar:3.26 fix src/
• Download and cache each version separately in the PHAR cache
• Update the registry to map to version-specific URL patterns

Implementation approach

We could modify the $knownPhars registry to support version mapping:

private array $knownPharVersions = [
    'php-cs-fixer.phar' => [
        'latest' => 'https://cs.symfony.com/download/php-cs-fixer-v3.phar',
        'v3' => 'https://cs.symfony.com/download/php-cs-fixer-v3.phar',
        '3.26' => 'https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/releases/download/v3.26.0/php-cs-fixer.phar'
    ]
];

This enhancement would provide more control to users who need specific versions of tools.