chore: Add FDv2 data source interfaces. #179

Job	Run time
test-platforms-and-versions (ubuntu-latest, 8)	43s
test-platforms-and-versions (ubuntu-latest, 11)	52s
test-contract-tests	50s
test-packaging	45s
test-platforms-and-versions (ubuntu-latest, 19)	58s
test-platforms-and-versions (ubuntu-latest, 17)	59s
	5m 7s

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