Add JWS Validation

[Lgdev07]

This pull request introduces the JWSValidation module, which is designed to validate JSON Web Signatures (JWS) received from Apple's App Store.

We've created a similar implementation and wanted to make it publicly available for use.

The idea of this module is to receive a string with the jws, and do the following:

• decode the JWS to get its header
• The header should have a "x5c" key with 3 certificates.
• We validate the chain certificate with the public root one available here https://www.apple.com/certificateauthority/
• Check if the X509 key inside the leaf certificate was really used to sign the payload

This is a validation for the JWS that Apple returns in some endpoints, it was tested in Get Transaction Info and Get Transaction History

Please take a look at the implementation and let me know if you have any questions.