Add Spark prefix for log option key

[Tartarus0zm]

To facilitate reusing Auron's common configurations across multiple engines,
such as the BATCH_SIZE option which uses different prefixes in Spark and Flink,
we removed the spark. prefix from all options when introducing SparkAuronConfiguration.
The prefix is automatically supplemented via getOptional.
We have discovered that prefixes are missing when only print option keys.