chore: Add file data source support for FDv2. #287

Job	Run time
test-contract-tests	4m 28s
test-platforms-and-versions (ubuntu-latest, 19)	3m 45s
test-platforms-and-versions (ubuntu-latest, 8)	3m 29s
test-platforms-and-versions (ubuntu-latest, 17)	3m 34s
test-packaging	4m 33s
test-platforms-and-versions (ubuntu-latest, 11)	3m 55s
	23m 44s

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