[FEATURE REQUEST]: Consider adding support for ValueTuples when defining UDFs

It is not uncommon to have people use DataFrames in Scala with schemas with structs as the following example show:
```
root
|-- _1: struct (nullable = true)
| |-- _1: integer (nullable = false)
| |-- _2: string (nullable = true)
|-- _2: integer (nullable = false)
```
When developing a a custom UDF in Spark.NET that would take a int and string, it would be very handy to be able to do something like the following:
```c#
Func CreateStructColumn = Udf((someInt, someString) => (someInt.Value, someString));
```

Currently if we do this, we get an exception message saying that ValueTuple is not supported. Is there a different way to do this currently? If not, could we add support for using ValueTuples as a representation of scala structs?