feat: commonizes several FDv2 related types in Internal #366

Job	Run time
test-packaging	4m 58s
test-platforms-and-versions (ubuntu-latest, 19)	3m 53s
test-contract-tests	4m 31s
test-platforms-and-versions (ubuntu-latest, 17)	3m 45s
test-platforms-and-versions (ubuntu-latest, 8)	3m 53s
test-platforms-and-versions (ubuntu-latest, 11)	3m 43s
	24m 43s

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