If the configuration is used to set the number of bytes, we'd better use `bytesConf`'.

Currently, if we want to configure `spark. sql. files. maxPartitionBytes` to 256 megabytes, we must set  `spark. sql. files. maxPartitionBytes=268435456`, which is very unfriendly to users.

And if we set it like this:`spark. sql. files. maxPartitionBytes=256M`, we will  encounter this exception:

Exception in thread "main" java.lang.IllegalArgumentException: spark.sql.files.maxPartitionBytes should be long, but was 256M
        at org.apache.spark.internal.config.ConfigHelpers$.toNumber(ConfigBuilder.scala:34)