Support for dask arrays

[bouweandela]

Because the datasets we use with the ESMValTool project are typically too large to fit into memory, we need support for lazy vertical interpolation in the ESMValCore package, see also ESMValGroup/ESMValCore#35.

Would support for dask arrays be a feature that is interesting for python-stratify? I think it could be used by a wider target audience if it's implemented here than if we only implement it for our own software. If there is an interest, I could make a pull request to add support for dask arrays to this package?

[bjlittle]

@bouweandela Sorry I'm late to the party, but if this is still of value to you guys and have capacity, then please do extend python-stratify to cope with dask arrays... that would be a definite community win for sure 👍

Awesome, thanks!