feat: commonizes several FDv2 related types in Server #369

Job	Run time
test-platforms-and-versions (ubuntu-latest, 17)	3m 56s
test-platforms-and-versions (ubuntu-latest, 19)	3m 51s
test-platforms-and-versions (ubuntu-latest, 11)	3m 59s
test-packaging	4m 39s
test-contract-tests	4m 28s
test-platforms-and-versions (ubuntu-latest, 8)	3m 50s
	24m 43s

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