Get rid of cached resolved `CompressBatchPromise`s from `ChunkCache`
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dktapps commented
Problem description
We currently keep around a lot of boxed caches inside resolved CompressBatchPromises.
These objects are a waste of memory and take a toll on the GC.
They also force the use of closures to retrieve promise values, which means even more useless objects if the cache has already been populated.
Proposed solution
This kind of change should be done in ChunkCache. It may cause some complexity increase, but the reduction in object allocations is worthwhile in hot paths.