CommitThroughput metrics can raise division by zero error

io.debezium.connector.oracle.logminer.TransactionalBufferMetrics.getCommitThroughput() tries to guard against division by zero. The problem is that the zero check is done against full precision duration while the caluclation is then converted to millis. This mean that sub-millis durations will get rounded to 0 and divison by zero can be raised.