Column with Incremental Run Length Encoding

[monsterkrampe]

closes #1

This PR adds a Column implementation with incremental run length encoding. It also implements a fitting ColumnScan and ColumnBuilder.
Also, the AdaptiveColumnBuilder is adjusted to use the RleColumn instead of the VectorColumn when the use of the latter would take significantly more memory (based on a heuristic).

[ellmau]

Casually glanced over the code (due to vacation).

I think @mmarx shall still look into it as well.

[monsterkrampe]

Thanks for your comments, I'm going to work through them :)

[mmarx]

Once we have decided whether we want to refactor AdaptiveColumnBuilder now or later, this can be merged (at least if we decide for later).