Commits on Feb 4, 2020

1. experimental: Allow adjusting of query plan & parsed/validated docume… …

   …nt cache.
   
   This introduces two experimental configuration options for existing internal
   cache stores:
   
   - `experimental_approximateDocumentStoreSizeMiB` is added to the `ApolloServer`
     constructor options and controls the _approximate_[1] size, in MiB, of the
     request pipeline document store, which is used to avoid repeated parsing and
     validation passes on queries which equate to the same `queryHash`[2].
   - `experimental_approximateQueryPlanStoreMiB` is added to the `ApolloGateway`
     constructor options and controls the _approximate_[1] size of the query plan
     cache, which is used to avoid recalculation on repeated queries which equate
     to the same `queryHash`[2].
   
   These are currently experimental because a more complete solution might
   more dynamically account for memory of various internal caches and vary
   their sizes based based on available memory and the overall server
   performance, rather than needing hard-coded values which are less than
   precise.
   
   [1]: "Approximate", because it's based on the `JSON.stringify`'d byte-length
        of the value being cached.
   [2]: The `queryHash` is a SHA-256 value of the incoming operation.

   

   abernix committed Feb 4, 2020
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2. Add CHANGELOG.md for #3755.

   

   abernix committed Feb 4, 2020
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3. docs: Add documentation for #3755.

   

   abernix committed Feb 4, 2020
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