Add `inject`-based test case support to evaluation function and docs #10

Job	Run time
Test (3.12)	35s
deploy / Setup	7s
deploy / deploy-staging / build-aws / Build (staging)	44s
deploy / deploy-staging / deploy-gcp-staging	-1s
deploy / deploy-staging / build-gcp	-1s
deploy / deploy-staging / deploy-staging-aws / Deploy (staging)	9s
deploy / Run Staging Validation Tests	0s
deploy / Await Manual Approval (Tests Failed)	0s
deploy / deploy-production	0s
	1m 33s

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