Fix MSIDLogger EXC_BAD_INSTRUCTION crash

[antrix1989]

Because MSIDLogger is not thread safe, it crashes during the tests. Run the following UT to reproduce the issue:

• (void)test_logger
  {
  while (true) {
  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^ {
  MSID_LOG_WARN(nil, @"BG thread");
  });

    MSID_LOG_WARN(nil, @"Main thread");
  

  }
  }