Add support for week function in postgres

[gcastill]

https://www.postgresql.org/docs/8.1/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT

[gavinking]

I'm not sure how I feel about this.

On the one hand, it does look like most of the other H5 dialects have a function named week(), though I don't remember whether they all have the same semantics.

On the other hand, should we perhaps just wait for H6, where we have already solved all these things in a totally disciplined and portable way, rather than just adding arbitrary things here and there in H5 without paying much attention to portability?

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