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[Depends on D4404, D4405, D4406] Algorithm to decide which steps to re-execute…

Description

[Depends on D4404, D4405, D4406] Algorithm to decide which steps to re-execute based on which versions are cached.

Summary: Resolves step versions, and uses step versions to determine whether a step would need to be re-executed in a memoized run.

Test Plan: test_versioned_execution_plan.py contains some tests that hit the code path. Waiting on version storage to land before I have more complicated logic tests.

Reviewers: sandyryza, yuhan, alangenfeld

Reviewed By: sandyryza

Differential Revision: https://dagster.phacility.com/D4407