feat(sdk): add the ability to specify custom keys #6976

Job	Run time
benchmark tests	4m 40s
go (examples)	53s
Protocol Buffer Lint and Gencode Up-to-date check	16s
go (sdk)	1m 41s
image build	1m 41s
go (service)	3m 7s
go (lib/ocrypto)	39s
integration tests	4m 43s
go (lib/fixtures)	40s
license check	54s
go (lib/flattening)	48s
otdfctl e2e tests	4m 42s
platform-xtest / cross-client-test	9m 8s
ci	1s
	33m 53s

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