feat: Add support for FDv1 fallback. #250

Job	Run time
test-platforms-and-versions (ubuntu-latest, 19)	3m 45s
test-packaging	4m 42s
test-platforms-and-versions (ubuntu-latest, 17)	3m 46s
test-platforms-and-versions (ubuntu-latest, 11)	3m 42s
test-platforms-and-versions (ubuntu-latest, 8)	3m 39s
test-contract-tests	4m 2s
	23m 36s

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