add batcher config to splunkhec exporter #32514

Job	Run time
collector-build	5m 11s
docker-build	5m 35s
supervisor-test	51s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	3m 8s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	2m 26s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	2m 31s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	2m 39s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	2m 41s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	2m 32s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	2m 35s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	2m 51s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	2m 54s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	2m 32s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	2m 50s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	2m 28s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	2m 48s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	2m 33s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	2m 50s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	2m 27s
kubernetes-test	1s
	54m 23s

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