Retarget the shadow driver

[wzrdtales]

Description

The shadow driver was originally added to potentially intervene actions to build up representations of the current state. Since this is not a use case in the db-migrate universe as db-migrate itself has no drivers included in the core at all anymore and only drivers that strictly follow pre-defined standards would fit in, it ended up dangling along.
It is going to be repurposed and is not going to target a single method anymore, but the whole driver. This will allow us to interpret a single instruction of an execution unit before actually running it and leaving this task to a processor. This in turn allows us to get information about the state. Some limitations are implied, such as highly dynamic non monitored tasks, that completely depend upon the direct entry state will not be monitorable and will need some work of thought to mitigate them.

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[wzrdtales]

done