Operation translation for List<T>

[roji]

We now support mapping CLR List<T> to PostgreSQL arrays (#392). We also have some nice operation translations for regular CLR arrays, but should also translate operations for List<T>, which is supported for mapping PostgreSQL arrays.

[austindrenski]

@roji Has anyone started working on this?

If not, I can start scoping out what we could translate in time for 2.1.

[roji]

Feel free to work on this, at least some things should be fairly easy. As a first goal it would be good to achieve party with what is already translated for arrays (length, indexing...)