feat: Add support for FDv1 fallback. #253

Job	Run time
test-contract-tests	4m 18s
test-platforms-and-versions (ubuntu-latest, 11)	1m 15s
test-platforms-and-versions (ubuntu-latest, 8)	1m 15s
test-platforms-and-versions (ubuntu-latest, 19)	1m 16s
test-packaging	3m 43s
test-platforms-and-versions (ubuntu-latest, 17)	59s
	12m 46s

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