Ability to address Frame columns in DF via `colsAtAnyDepth` functionality

See the example below
```
class P(val x: Double, val y: Double)
class V(val w: Int, val p: List

)

val a = List(2) { V (1, List

(5){ P(2.0, 2.0) })}

val df = a.toDataFrame(maxDepth = 2)
df.update { dfsOf() }.with { it*2 } // this statement does nothing
```