Map authorization for IssueAuth

[alexeykoren]

Added a new mehod map_authorization for IssueBundle to support workflow in Librustzcash where we trasform a Transaction from one authorization state (e,g, Unauthorized) to another (e.g. Aurhotized/Signed) by transfroming all underlying bundles

[what-the-diff]

PR Summary

• Added a New Authorization State Transition Method to IssueBundle
  This update provides a new process for how the system changes or transitions between differing authorization states. Implementing this will allow more flexibility and control over different stages of authorization within our system.