Enable mixed types as string in GpuJsonScan

[andygrove]

Closes #9353

Depends on rapidsai/cudf#14572

Changes in this PR:

• Enable new cuDF mixed_types_as_string option when reading JSON via GpuJsonScan
• Add link to tracking issue for enabling this for GpuJsonToStruct ([FEA] Enable mixed types as string in GpuJsonToStruct #10253)
• Update tests

[andygrove]

build

[andygrove]

There are some json_test failures. I am investigating.

test_from_json_struct_of_struct[:

java.lang.IllegalArgumentException: StructType(StructField(name,StringType,true), StructField(age,IntegerType,true)) is not supported for GPU processing yet.
2024-01-23T16:25:04.5839817Z [2024-01-23T16:22:35.824Z]         at com.nvidia.spark.rapids.GpuColumnVector.getNonNestedRapidsType(GpuColumnVector.java:423)
2024-01-23T16:25:04.5840302Z [2024-01-23T16:22:35.824Z]         at com.nvidia.spark.rapids.GpuCast$.doCast(GpuCast.scala:635)
2024-01-23T16:25:04.5841006Z [2024-01-23T16:22:35.824Z]         at org.apache.spark.sql.rapids.GpuJsonToStructs.$anonfun$doColumnar$7(GpuJsonToStructs.scala:221)

test_from_json_struct_of_list:

java.lang.IllegalArgumentException: ArrayType(StructType(StructField(name,StringType,true), StructField(class,StringType,true)),true) is not supported for GPU processing yet.

[andygrove]

build