Refactor metastore and merge with common and dkan modules #3825
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Fixes #3746
Fixes #3761
Fixes #3736
Very much WIP, started experimenting with some of the changes that we're thinking about for a 3.x release, and was hard to work on any one in isolation. Also addresses some things in #3772 but that issue is already in progress via #3774. Will need to resolve all these things before this branch is usable.