Add supported Country check

[iekadou]

Add isCountrySupported function

[what-the-diff]

PR Summary

• Modification of TIN.php file
  A key file used in our system has been updated, resulting in improved performance and increased efficiency.
  • Adaptation of $algorithms property
    The property is no longer uniquely tied to each instance of our object but is shared across all instances, which is useful in saving memory and computational resources.
  • Introduction of a new method - isCountrySupported
    This new function simplifies the process of checking the validity of country codes, increasing the speed of operations involving country data.
  • Refactoring of getAlgorithm method
    By using the shared $algorithms property rather than instance-specific ones, this method is now more performance-efficient.
  • Added return type declaration for isValid method
    With the inclusion of explicit method return type, we can now avoid potential programming mistakes and improve the overall code stability.
  • General code formatting improvements
    Including some cosmetic changes to the code to make it more readable and aesthetically pleasing. This contributes towards better maintainability of the code.

[drupol]

Do you mind fixing the code style ./vendor/bin/grumphp run --tasks=phpcsfixer ?

[drupol]

Thank you!