WIP: Passports

[rushtong]

Addresses

TODO

Summary

This is a rough first pass/proof of concept at trying to generate a compliant GA4GH passport implementation.

Things that we need to review for achieving compliance:

• Request a ga4gh_passport_v1 scope for all passport requests
• Encryption. The spec requires that: "Visas are signed JWTs encoded into strings using JWS Compact Serialization". This PR provides a decoded version for demonstration purposes
• Implement something to associate the passport to a Sam user.
• Complete the various claim type implementations

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Have you read CONTRIBUTING.md lately? If not, do that first.

• Label PR with a Jira ticket number and include a link to the ticket
• Label PR with a security risk modifier [no, low, medium, high]
• PR describes scope of changes
• Get a minimum of one thumbs worth of review, preferably two if enough team members are available
• Get PO sign-off for all non-trivial UI or workflow changes
• Verify all tests go green
• Test this change deployed correctly and works on dev environment after deployment