Encapsulate CDK Context items in compound objects

[chelma]

Description

When chelma@ was first figuring out how to pass information from the Python side to the CDK side, a pattern emerged of passing a bunch of single-item context values at the highest level of a nested JSON dictionary. This results in increased wiring-work when changes are made to the specific context values, as top-level values require more work to wire than nested-values. We've since moved to using predominantly nested, compound objects since then (see the Capacity Plan, for example).

This task is to move the older, top-level single-item values into compound objects, as makes sense.

Related Tasks

• Add State & Event Versioning #43

Acceptance Criteria

• All CDK Context values passed from Python should be in compound objects unless there is justification otherwise.