Local page caching

A client should be able to locally cache pages, and submit the hash of the locally cached page with a read request.

If the hash matches what the server has, it can return an empty data array to indicate "you have the same data as I do, read the local data".

This should generally improve read performance, but we will need to store checksums locally (can be in-memory).

We'll also have to submit the checksums of the data on each write (then the server doesn't have to implement it).

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