security/py-josepy: JOSE protocol implementation in Python

JOSE (Javascript Object Signing and Encryption) is a Python implementation
of the standards developed by IETF Javascript Object Signing and Encryption
(Active WG), in particular the following RFCs:

• JSON Web Algorithms (JWA)
• JSON Web Key (JWK)
• JSON Web Signature (JWS)

Originally developed as part of the ACME protocol implementation.

WWW: https://josepy.readthedocs.io/en/latest/

Differential Revision: https://reviews.freebsd.org/D14013