[BUG] ColumnarFileFormat does not have a pretty string

[amahussein]

Describe the bug

The RAPIDS plugin does not generate the correct value for the format field in the eventlog.
Instead of dumping a pretty string value of the format, it dumps the object string (i.e com.nvidia.spark.rapids.GpuParquetFileFormat@9f5022c)

It would be nice to fix that to make it easy to analyze the eventlog. Otherwise, the consumer of the eventlog has to keep track of any modification in the ClassNames in the RAPIDS code which is not ideal.

This impacts the ColumnarFileFormat types

GpuHiveParquetFileFormat
GpuHiveTextFileFormat
GpuOrcFileFormat
GpuParquetFileFormat

Sample eventlog:

Execute GpuInsertIntoHadoopFsRelationCommand /path/to/warehouse/db/tableName, false, [dt#23, lvl#30], com.nvidia.spark.rapids.GpuParquetFileFormat@4be4680b, [serialization.format=1, mergeSchema=false, __hive_compatible_bucketed_table_insertion__=true, partitionOverwriteMode=DYNAMIC], Overwrite, CatalogTable(\nDatabase: databaseName\nTable: tableName\nOwner: root\nCreated Time: Tue Feb 25 16:58:00 UTC 2025\nLast...