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This is a _very_ early, minimal plumbing of the execution graph builder into the experimental planning engine. The goal here is mainly just to prove the idea that the planning engine can build execution graphs using the execgraph.Builder API we currently have. This implementation is not complete yet, and also we are expecting to rework the structure of the planning engine later on anyway so this initial work focuses on just plumbing it in to what we had as straightforwardly as possible. This is enough to get a serialized form of _an_ execution graph included in the generated plan, though since we don't have the apply engine implemented we don't actually use it for anything yet. In subsequent commits we'll continue building out the graph-building logic and then arrange for the apply phase to unmarshal the saved execution graph and attempt to execute it, so we can hopefully see a minimal version of all of this working end-to-end for the first time. But for now, this was mainly just a proof-of-concept of building an execution graph and capturing it into its temporary home in the plans.Plan model. Signed-off-by: Martin Atkins <mart@degeneration.co.uk>