Feature/prepared statement support2

[amirtuval]

Added support for running prepared statements.

I was able to achieve this by imitating how the vertica jdbc driver does this.

I did my best to write documentation in the code, but I was not sure how to test this, so I hope it's alright.

Wrote functional tests for this feature - this is the best way to see how to use it.

[wvanbergen]

This PR completely escaped my attention, sorry! Are you still interested in getting this merged?

[amirkang]

Sure