feat: implement DynamoDBDataSource + tests #1871

Job	Run time
contract-tests	4m 45s
build-test-server-mac	4m 32s
build-test-server-windows	18m 39s
build-test-server-mac-curl	5m 37s
build-test-server-windows-curl	18m 15s
build-test-server-curl	8m 2s
build-test-server	7m 49s
contract-tests-curl	4m 54s
	1h 12m 33s

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