add framework tests (i.e. vitest)#1349

ibolmo wants to merge 2 commits intoibolmo/bra-4115-braintrust-eval-should-work-with-evals-with-top-level-awaitbraintrustdata/braintrust-sdk-javascript:ibolmo/bra-4115-braintrust-eval-should-work-with-evals-with-top-level-awaitfrom

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