WIP: Make SchemaUpgrader faster

[clenfest]

The idea is to make SchemaUpgrader faster by precomputing each type into a map that can be passed around once rather. Ideally we would be able to entirely get rid of otherSubgraphs as a parameter to SchemaUpgrader before this PR is ready.

Note that although this works with tests, I think there may be an issue with interfaces that isn't covered by tests, so do not merge unless someone has a chance to look at this with a critical eye. (I think the issue is that the map is built by iterating over objectTypes but later code iterates over types() which may include interfaces.

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