[BUG] ScanJson and JsonToStructs don't process escapes in key names

[revans2]

Describe the bug
It looks like escape processing is not being done on key names, which results in us potentially missing data. This is a little hard to reproduce because of how scala does escape processing, but...

Seq("{\"\\u0064\\u0061t\\u0061\": \"TEST\"}").toDF("value").repartition(1).selectExpr("*", "from_json(value, 'data string').data").show(false)

produces the result 'TEST', on the CPU, but null on the GPU.

[revans2]

I am not sure what is happening, it works for me some of the time, but not all of the time, and I don't know why. I will keep digging.