Generic Parser

[jonchurch]

An attempt at solving for #22 (specifically #22 (comment)) and sketching out what the generic interaface would look like.

This is a draft so we can see the diff cleanly, but it's my intent for Generic ot be hashed out on the generic branch.

This is an approach which encapsulates Generic as the only middleware to have a parser option.

Users of generic would be required to bring a type and a sync parse function

[jonchurch]

Breaking this function down into steps was very helpful for me when wrapping my head around what was a universal concern vs parser specfic. leaving them here hoping they help others