Add a roundrobin connector, that can help single thread components to scale #32529

Job	Run time
collector-build	5m 8s
docker-build	5m 25s
supervisor-test	49s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	3m 1s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	3m 10s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	2m 59s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	2m 23s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	2m 59s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	2m 37s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	2m 27s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	2m 20s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	2m 50s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	2m 53s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	3m 7s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 8s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	2m 54s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	2m 44s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	2m 27s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	2m 44s
kubernetes-test	1s
	56m 6s

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