feat(sdk): add the ability to specify custom keys #6960

Job	Run time
benchmark tests	4m 16s
Protocol Buffer Lint and Gencode Up-to-date check	23s
go (examples)	49s
go (sdk)	1m 59s
image build	1m 52s
go (service)	3m 8s
go (lib/ocrypto)	47s
integration tests	4m 37s
go (lib/fixtures)	31s
license check	54s
otdfctl e2e tests	4m 46s
go (lib/flattening)	36s
platform-xtest / cross-client-test	9m 3s
ci	1s
	33m 42s

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