Upgrade to Symfony 6 and PHP 8

Changed

• Upgrade to Symfony 6. Migrated to new Symfony authentication system.
• Upgrade tp PHP 8

Switch dependency to symfony/security-guard

• Switch dependency to symfony/security-guard
• Update code style tooling

Allow Symfony 5 components

• Update composer.json to allow either Symfony ^4.4 or ^5.2 components

Upgrade php version

• Upgraded to PHP 7.4 | 8.0
• Upgraded to composer 2
• Added Psalm for static analysis
• Removed composer.loclk from package

Security updates

• Updated Symfony components to 4.4.13 and later
• General vendor updates
• Expanded test coverage

First stable release

1.0.0

no message

Changed config option for allowed clients

Changed config option for allowed clients to enable the use of environment variables