[exporter/file] Add group_by configuration #28381

Job	Run time
collector-build	6m 52s
docker-build	7m 7s
supervisor-test	50s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 41s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	3m 30s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 23s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 25s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 57s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	3m 20s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 13s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 36s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	5m 41s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	3m 23s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 31s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 17s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 55s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	3m 18s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	5m 16s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 16s
kubernetes-test	1s
	1h 20m 32s

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