feat: Add support for FDv1 fallback. #257

Job	Run time
test-platforms-and-versions (ubuntu-latest, 8)	3m 47s
test-platforms-and-versions (ubuntu-latest, 19)	3m 41s
test-platforms-and-versions (ubuntu-latest, 11)	3m 49s
test-packaging	4m 45s
test-contract-tests	4m 27s
test-platforms-and-versions (ubuntu-latest, 17)	3m 35s
	24m 4s

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