Api / Graphql : Allow version as singleton argument on singleton

[joselcvarela]

Scope

On #21386 we have included support to fetch relational data when requestong a version of an item.

Although, this support were included only for existing resolvers, but we didn't have support to request a version of a singleton in Graphql.
The support for it is only included on <collection>_by_id(id: ID!, version: String), but singletons so not have this resolver.

Since a singleton is retrieved using <collection> resolver, in this PR we just add version argument to this resolver.
In the end, the resolver for singleton will be <collection>(version: String)

What's changed:

• Add support to request a version for a singleton on Graphql

Potential Risks / Drawbacks

• Since these are only additions, I don't foresee any issue

Review Notes / Questions

• N/A

[changeset-bot]

🦋 Changeset detected

Latest commit: ca57069

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

This PR includes changesets to release 2 packages

Name	Type
@directus/api	Patch
directus	Patch

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[paescuj]

LGTM!