Adds new error codes for required verificationsBreaking changes

// GET /v1/accounts/{{CONNECTED_ACCOUNT_ID}}
{
  ...
  "requirements": {
    "currently_due": ["documents.proof_of_ultimate_beneficial_ownership.files"],
    "errors": [
      {
        "code": "information_missing",
        "requirement": "documents.proof_of_ultimate_beneficial_ownership.files",
        "reason": "We identified that your business is owned by holding companies that require additional information to be collected. Please provide documents that include information for each applicable holding company. For more information, see https://support.stripe.com/questions/beneficial-ownership-verification-for-holding-companies. The new holding companies we have identified are: ACME INC."
      }
    ],
    ...
  },
  ...
}

{
  ...
  "requirements": {
    "currently_due": ["documents.proof_of_ultimate_beneficial_ownership.files"],
    "errors": [
      {
        "code": "invalid_signator",
        "requirement": "documents.proof_of_ultimate_beneficial_ownership.files",
        "reason": "We could not verify the professional certifying body of this document."
      }
    ],
    ...
  },
  ...
}

{
  ...
  "requirements": {
    "currently_due": ["{{AUTHORIZER_PERSON_TOKEN}}.relationship.authorizer"],
    "errors": [
      {
        "code": "verification_failed_authorizer_authority",
        "requirement": "{{AUTHORIZER_PERSON_TOKEN}}.relationship.authorizer",
        "reason": "The authority of the authorizer could not be verified. Authorizers must be one of Director, Chief Executive Officer listed on acra.gov.sg."
      }
    ],
    ...
  },
  ...
}

{
  ...
  "requirements": {
    "currently_due": ["documents.proof_of_ultimate_beneficial_ownership.files"],
    "alternatives": [
      {
        "original_fields_due": ["documents.proof_of_ultimate_beneficial_ownership.files"],
        "alternative_fields_due": ["company.ownership_exemption_reason"],
      }
    ],
    "errors": [
      {
        "code": "verification_rejected_ownership_exemption_reason",
        "requirement": "company.ownership_exemption_reason",
        "reason": "The ownership exemption reason was rejected."
      }
    ],
    ...
  },
  ...
}