Try to shrink stack space

[adamchalmers]

Run this:

RUSTFLAGS=-Zprint-type-sizes cargo +nightly build -j1 > type-sizes.txt && top-type-sizes -ws -h33 -p 'run_with_caching\(\)' < type-sizes.txt | head -n 5

and replace run_with_caching with whatever function you want, to see its stack space.

This PR:

• Boxes some Futures, moving them off the stack into the heap. In theory, worse performance, less stack overflows. I am very confident that the hit from following a pointer to the stack is going to be negligible.
• Breaks some big functions with lots of awaits into smaller functions, so that the state machine which the async fn creates has fewer and smaller states.

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Project	Deployment	Actions	Updated (UTC)
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