[WIP] ChunkedArray, Column and Table

[nevi-me]

ref #4

This PR implements a ChunkedArray, Column and Table, which although not part of the Arrow format, are used in CPP, Python, Go and potentially other implementations.

This is currently incomplete, and I need to think of:

• How to make the functions module work with Column instead of PrimitiveArray<T>.
• Where to use references to avoid copies and moves
• How to zero-copy arrays and chunks thereof

[nevi-me]

As part of this, it would be great if columns could be typed, so I can avoid calling functions to get Array and convert it to a concrete arrow array. Perhaps that way, I'd be able to accept columns directly into operations.