Make BadRecordException serializable

Migrating a Spark application from 2.4.x to 3.1.x and finding a difference in the exception chaining behavior. In a case of parsing a malformed CSV, where the root cause exception should be Caused by: java.lang.RuntimeException: Malformed CSV record, only the top level exception is kept, and all lower level exceptions and root cause are lost. Thus, when we call ExceptionUtils.getRootCause on the exception, we still get itself.
The reason for the difference is that RuntimeException is wrapped in BadRecordException, which has unserializable fields. When we try to serialize the exception from tasks and deserialize from scheduler, the exception is lost.
This PR makes unserializable fields of BadRecordException transient, so the rest of the exception could be serialized and deserialized properly.