Handle unmarshalling lists of custom scalars from the cache

[SeppahBaws]

Fixes #1321

The marshalling step already had an extra check to marshal the individual values if it encountered an array. The unmarshalling step, however, was not invited to the party and just passed the raw values from the cache to the unmarshalling handler in the config.
Now the unmarshalling step has been invited and will pass the individual values of arrays to the proper unmarshall handler in the user's config.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 3c17473

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

This PR includes changesets to release 8 packages

Name	Type
houdini	Patch
houdini-adapter-auto	Patch
houdini-adapter-cloudflare	Patch
houdini-adapter-node	Patch
houdini-react	Patch
houdini-svelte	Patch
houdini-plugin-svelte-global-stores	Patch
create-houdini	Patch

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[AlecAivazis]

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