code: def read_string(self):
      result = b""
      while True:
          b = self.read_byte()
          if b == b"\x00":
              break
          result = result + b
      return result
  
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 4 for calling the PostgresPacketReader obj's underlying member method code with example usage: obj.read_string() and returns: result