[FEATURE REQUEST]: Spark 4.0 support for VariantType

[smokedlinq]

Is your feature request related to a problem? Please describe.
Need to utilize the VariantType data type in Spark 4.0 to describe things like JsonObject in a schema.

Describe the solution you'd like
Add VariantType as a supported data type.

Describe alternatives you've considered
Making my own data type for the time being...

public sealed class VariantType : DataType
{
}

Additional context
https://spark.apache.org/docs/latest/api/java//org/apache/spark/sql/types/DataTypes.html