Replace psychopg2.extras DictCursor with custom code.

[cheezyrock]

The Psychopg2 library is currently utilized in the postgres connector, and utilizes a helper function to create a DictCursor.

The task is to analyze and rebuild a custom version of this within DADS, using only Python primitives (no additional libraries) that could replace that library. This will very very little impact on DADS as a whole (at least as long as that psychopg2 functionality exists, but will be a great learning experience with high value for developers. It should be accompanied wit ha comment inside the code to fallback to the existing DictCursor if newly made code reaches a critical failure state.