code: def add_field(self, field: PostgresField):
      return (
          self.add_string(field.name.encode())
          .add_int32(field.table_id)
          .add_int16(field.column_id)
          .add_int32(field.object_id)
          .add_int16(field.dt_size)
          .add_int32(field.type_modifier)
          .add_int16(field.format_code)
      )
  
imports: import struct
  from typing import List, Any, BinaryIO, Sequence, Dict
  from mindsdb.api.postgres.postgres_proxy.utilities import strip_null_byte
  from mindsdb.utilities import log
  import time
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_fields import PostgresField
  from mindsdb.api.postgres.postgres_proxy.postgres_packets.postgres_message_identifiers import PostgresBackendMessageIdentifier, PostgresFrontendMessageIdentifier, PostgresAuthType
label_desc: Use image node_id 12 for calling the PostgresPacketBuilder obj's underlying member method code with example usage: obj.add_field(field) and returns: self