[Feature Request]: Parse and validate session tokens

[MasterJ93]

Summary

Methods related to session tokens will be needed.

Pain points

At this time, ATProtocolConfiguration's getSession and refreshSession has a few lines of code that shouldn't run unless they're absolutely necessary. There needs to be a way for the session tokens to be parsed so as to find out the issue and expiry dates, as well as the signature. The signature should be able to be validated; the public key is located under UserSession.didDocument.verificationMethod[#].publicKeyMultibase.

Considered Alternatives

No response

Is this a breaking change?

No

Library Examples

No response

Additional Context

No response