[TUF] Managing TUF Versions

[nate-double-u]

Implement version management for TUF’s python reference implementation. The implementation does not currently have a way to migrate TUF repositories or clients to a new TUF version that has breaking changes. This project will be the implementation of a proposal for coordinating specification versions between a repository and a client to prevent interruptions in access to updates after a major version change to the specification.

Mentors: Marina Moore (@mnm678), Zack Newman (@znewman01)

https://github.com/cncf/mentoring/blob/main/summerofcode/2022.md#managing-tuf-versions