v3.1.0: Data model 3, site curator role

Updates for data model v3, enable site curator role, refactoring for more detailed decision logging

What's Changed

• v2.0.0: Opa uses Vault to store data by @daisieh in #45
• v2.1.0: OPA Service tokens and health check by @OrdiNeu in #50
• v3.0.0: Site roles, program authz, user authz by @daisieh in #57
• Hotfix: need "as" clause by @daisieh in #58
• Usernames aren't secrets by @daisieh in #59
• If vault stores already exist, don't wipe them out by @daisieh in #60
• DIG-1189: Authz user can view datasets by @daisieh in #61
• DIG-1652: Remove use of OPA_SERVICE_TOKEN and OPA_ROOT_TOKEN by @daisieh in #62
• Opa should always renew its IDP information by @daisieh in #63
• Replace 'single quote' in PR titles by @mshadbolt in #64
• Update to model 3 by @SonQBChau in #65
• DIG-1705: implement site-level curator role by @daisieh in #66
• DIG-1506: Make the decision logic in Opa more transparent by @daisieh in #67
• hotfix: authx can always see permissions by @daisieh in #68
• Hotfix: site curator is allowed to curate always by @daisieh in #70
• v3.1.0: Data model 3, site curator role by @daisieh in #69
• hotfix: remove default users by @daisieh in #72

Full Changelog: v3.0.0...v3.1.0