feat: Introduce "source" concept #626
                
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Description
The following introduces a "source" concept that can be used to query different types of resources. The long-term vision here goes much broader:
SanityInstanceshould no longer be an inherited tree structure. This will rather be a single object which contains global information (e.g. token). There will be no re-use of any state acrossSanityInstance.sourceparameter. This is a single parameter (instead of theprojectId/datasettuple) that can easily be passed around. If you're making higher-order helpers you just need to accept a single source object.sourceobjects. In the future these objects will also contain type information. These should also be owned by@sanity/client. In this PR we're mapping it to the existing experimental resource API, but the intention is for@sanity/clientto provide a proper source-based API which we're re-exporting/using here in SDK.SanityInstanceso that you can change it.sourceobjects. This gives them more flexibility in how to structure their applications.export const PRODUCTS = datasetSource(projectId, "datasets").(This is based on #619)
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Testing
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