DocumentTransform: use a WeakCache

[phryneas]

This is option 1 of 2 - I'll open a PR going a bit further and replacing a lot of the logic with optimism in a bit. Will be linked here.

Checklist:

• If this PR contains changes to the library itself (not necessary for e.g. docs updates), please include a changeset (see CONTRIBUTING.md)
• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 263ae13

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@apollo/client	Patch

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[github-actions]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	37.29 KB (+0.03% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	43.73 KB (+0.03% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	42.21 KB (+0.03% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	32.79 KB (+0.07% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	31.45 KB (+0.01% 🔺)
import { ApolloProvider } from "dist/react/index.js"	1.28 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.26 KB (0%)
import { useQuery } from "dist/react/index.js"	4.34 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.16 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	4.65 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.47 KB (0%)
import { useMutation } from "dist/react/index.js"	2.61 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.6 KB (0%)
import { useSubscription } from "dist/react/index.js"	2.29 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	2.25 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	4.33 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	3.79 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	3.83 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.27 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.05 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	3 KB (0%)
import { useFragment } from "dist/react/index.js"	2.15 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.1 KB (0%)

[phryneas]

This is a kinda-minor breaking change here - if we kept this key in memory here, we would again risk strongly referencing the original DocumentNode.
It might be fine to still keep it in here, and if we decide on that, I'll experiment if this will actually hinder it from cache-collection, but on the other hand we also just don't need this property.

@jerelmiller what's your feeling on this change?

[phryneas]

Essentially, this PR decouples the Trie and the data - the Trie only stores the cache keys (which are empty objects, not the array used to access the Trie), while the data is stored in the WeakCache.
This enables us to have a max size, which is impossible for a Trie, but possible for a WeakCache.