[4.0] experiment: namespace hook-related types

[phryneas]

I promised I'd do a PR so we can see this in action for one hook - WDYT @jerelmiller ?

No change in runtime files: https://github.com/apollographql/apollo-client/actions/runs/13965926007?pr=12466

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Latest commit: 3646438

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[svc-apollo-docs]

⚠️ Docs preview not attached to branch

The preview was not built because the PR's base branch jerel/inline-react-types is not in the list of sources.

An Apollo team member can comment one of the following commands to dictate which branch to attach the preview to:

• !docs set-base-branch version-2.6
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Build ID: 46dd71345415bd406b085e81

[pkg-pr-new]

npm i https://pkg.pr.new/@apollo/client@12466

commit: 3646438

[jerelmiller]

Will use this but do this on #12465 instead