feat: add CAS ticket validation using ecphp/ecas

[drupol]

This PR:

• Introduces a new TicketValidationInterface concrete implementation, utilizing the ecphp/ecas library. This implementation does not return false but instead throws exceptions when issues arise, requiring users to handle exceptions appropriately. To ensure that developers catch exceptions as needed, we must verify that the calling code is equipped to handle them properly.
• Test: The updated tests focus on evaluating the public interface, while private methods are indirectly tested through the expanded PHPUnit data provider list that accommodates various use cases. This approach enables thorough coverage of the codebase while maintaining appropriate encapsulation of private methods.
• Is related to Request for comment - About TicketValidationInterface #64