[pkg/ottl] introduce FormatTime() converter function #48686

Job	Run time
collector-build	8m 13s
docker-build	8m 29s
supervisor-test	53s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	6m 24s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 39s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 3s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 0s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	6m 35s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 28s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 5s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 7s
kubernetes-test	1s
	57m 57s

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