Allow Bartiq to evaluate only top-level resources

[mstechly]

Often when doing QRE research we care only about the top-level resources. Performing evaluation on the whole tree is slow and often unnecessary, so we could have a utility which gives top-level only.

How you envision the solution

I think we could add a new method called evaluate_top_resources which would take in the same inputs as evaluate, but would return a dictionary of resources instead.
I'd even say that these could be name: value pairs, rather than name: resource_object pairs.

[mstechly]

I think that with the introduction of EXPAND_RESOURCES and resource_values we can close this issue, as it's effectively done – i.e. user can get resource_values and when you don't expand resources the evaluation would be similarly fast?
I don't think it's 1:1, but it's close enough to me that I don't think we need this issue anymore until it resurfaces for whatever reasons.
WDYT @dexter2206 ?