feat: add LDValueConverter and LDContextEncoder to common (#187) #565

Job	Run time
test-packaging	4m 37s
test-contract-tests	4m 15s
test-platforms-and-versions (ubuntu-latest, 17)	3m 49s
test-platforms-and-versions (ubuntu-latest, 19)	3m 55s
test-platforms-and-versions (ubuntu-latest, 8)	3m 36s
test-platforms-and-versions (ubuntu-latest, 11)	3m 59s
	24m 11s

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