Create Scratcher

## What shortcoming will this fix cover
At the moment, Jetedge can really only create new objects; the Scratcher interface will allow for users to provide template objects and have modifications applied to them.

## Why its important to make this change
With this change, users will be able to either provide a prepopulated object that requires edits, or a PojoStream that requires 'flat-mapping'

## How much time I would invest in making this patch (if I had the free time to do it)
15 hours

The issue does not name any files, tests, or entry points. Start by locating the existing object-creation and PojoStream implementations, then determine how a Scratcher would apply modifications to supplied template objects or flat-map a PojoStream; done means both described use cases are supported.

Written by the indexing model from the issue text.