Feature/gateway upgrade mode

[jstuczyn]

implements naive versions NET-451 and NET-450 as part of NET-341

depends on #5957

relevant API changes:

nym-gateway-requests

Changed

• bumped up CURRENT_PROTOCOL_VERSION from 5 to 6 ('upgrade mode')
• ServerResponse::Authenticate contains upgrade_mode flag to indicate whether gateway thinks the system is undergoing the upgrade
• ServerResponse::Register contains upgrade_mode flag to indicate whether gateway thinks the system is undergoing the upgrade
• ServerResponse::Bandwidth contains upgrade_mode flag to indicate whether gateway thinks the system is undergoing the upgrade
• ServerResponse::Send contains upgrade_mode flag to indicate whether gateway thinks the system is undergoing the upgrade

nym-credentials-interface

Added

• BandwidthCredential to act as a wrapper for different types of credentials. current the old CredentialSpendingData (i.e. ticketbooks) and jwt tokens issued during upgrade mode. in the future it will also include emergency mode credentials issued by signer quorum:

nym-authenticator-requests

Added

• BandwidthClaim type to wrap around BandwidthCredential and to also include an explicit type (i.e. mixnet/wg entry/exit)
• v6 version of authenticator messages
  • each response type includes additional upgrade_mode_enabled: bool field
  • FinalMessage uses BandwidthClaim instead of CredentialSpendingData for the credential field

Changed

• FinalMessage trait method credential() now returns Option<BandwidthClaim> rather than Option<CredentialSpendingData> to allow the upgrade mode flow where user would not have a valid zk-nym

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