feat: Add support for FDv1 fallback. #252

Job	Run time
test-packaging	4m 37s
test-platforms-and-versions (ubuntu-latest, 8)	3m 50s
test-platforms-and-versions (ubuntu-latest, 11)	3m 38s
test-platforms-and-versions (ubuntu-latest, 17)	3m 48s
test-platforms-and-versions (ubuntu-latest, 19)	3m 33s
test-contract-tests	4m 19s
	23m 45s

Provide feedback