[FEA] Support casting operations on nested types

**Is your feature request related to a problem? Please describe.**
Currently we support `castTo` on primitive data types. This request is to extend this functionality/operator to nested types like lists, structs, and list of structs.

**Describe the solution you'd like**
One should be able to call a cudf function to cast an `array(floats)` for example to an `array(doubles)`. We should also allow other valid casts that we support today to nested type category.