Listable data sources should not require identifier

[arjunrajinstaclustr]

Is your feature request related to a problem?

Listable data sources (GET requests) that are not tied to a CRUD resource should not require a resource identifier.

Example use case - "Get all posts created by my user". In such a case, the authorization mechanism (eg - API key) for the API would identify the user.

Describe the solution you'd like

Same as acceptance criteria.

Acceptance criteria

• Ability to create a listable data source without an identifier.
• Should not throw the error - Error: could not find any identifier property in the resource schema definition

Describe alternatives you've considered

Workaround is to structure the endpoint path to contain a redundant identifier.

Additional context

Add any other context or screenshots about the feature request here.

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[arjunrajinstaclustr]

Sorry, mistook the error message I posted above for a missing identifier on the path, whereas it is complaining about a missing identifier on the response schema. I have already mentioned possibly skipping the identifier requirement for the listable data sources on #328, so closing this issue.