Add support for streaming result sets

[mattbishop]

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One thing I love about node-postgres is it's streaming result sets. I have applications that select thousands of rows and I don't want them all in a single result array. It's important to have a stream-like option that uses Postgres cursors to work through result sets.

[Soremwar]

I am very interested in implementing this feature, however it might take a while (I know waiting for almost a year sucks but I'm kinda new around here :smile: )

Any progress will be reported here

[shivajivarma]

+1 Very much needed, to access large set of data.