Allowlist identifiers errors

An index of Clerk errors related to allowlist identifiers.

`AllowlistIdentifierNotFound`


{
    "shortMessage": "Identifier not found",
    "longMessage":  "No identifier was found with id <identifierID>",
    "code":         "resource_not_found_code"
}

`DuplicateAllowlistIdentifier`


{
    "shortMessage": "duplicate allowlist identifier",
    "longMessage":  "the identifier <identifier> already exists",
    "code":         "duplicate_record_code"
}