Deal with compound/composite keys

[eemmiillyy]

Is your feature request related to a problem? Please describe.

With direct SQL access users will be able to create composite primary keys. This will not work with the SDK. We need to eventually support these cases. This will require an API surface change since alot of our SDK methods are unkeyed and are previously assumed to be an id or xata_id. Since this is unkeyed input and the user may not have either of those fields as primary keys (or at all) we cannot rely on those assumptions anymore.

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