The attestation controller should correctly populate VC fields

[jleach]

The schema has been decided on for the attestation credential (#1714) and now the controller should correctly populate these values.

{
  "attributes": [
    "issue_date_dateint",
    "validation_method",
    "app_version",
    "app_vendor",
    "app_id",
    "operating_system",
    "operating_system_version"
  ],
  "schema_name": "app_attestation",
  "schema_version": "1.0"
}

Values to Use

• "issue_date_dateint". Set to the time the credential was issued.
• "validation_method". Enum that denotes if App Store Receipts (< iOS 14), Apple Attestation (>= iOS 14), or Google Integrity API was used.
• "app_version". The mobile version number of the application ie. v1.0.15-1543
• "app_vendor". The mobile application vender ie. "Government of British Columbia". This will not change for us and can be imported from constatns.
• "app_id". Use the bundle ID. ie. "ca.bc.gov.BCWallet"
• "operating_system". Enum that is either "ios" or "android" all lower case. This can be sent by mobile application but I think it is just as accurate and more simple to determine this based on the attestation technique (google vs apple).
• "operating_system_version". The current version of the mobile operating system. ie. 14.0.3