feat(mult): add mutichain aggregator (#1098) #14

Job	Run time
Unit, doc and integration tests	3m 22s
Unit, doc and integration tests	3m 22s
Unit, doc and integration tests	3m 22s
push-swagger / Copy swagger	18s
push-swagger / Copy swagger	9s
push-swagger / Copy swagger	11s
Linting / lint	2m 22s
Linting / lint	2m 22s
Linting / lint	2m 22s
Docker build and docker push / build-and-push	7m 54s
Docker build and docker push / build-and-push	7m 54s
Docker build and docker push / build-and-push	7m 54s
	41m 32s

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