[connector/signaltometrics]Add config validation and custom ottl func… #18294

Job	Run time
arm-unittest-matrix (receiver-0)	8m 6s
arm-unittest-matrix (receiver-1)	9m 55s
arm-unittest-matrix (receiver-2)	11m 0s
arm-unittest-matrix (receiver-3)	9m 10s
arm-unittest-matrix (processor-0)	5m 37s
arm-unittest-matrix (processor-1)	7m 38s
arm-unittest-matrix (exporter-0)	5m 0s
arm-unittest-matrix (exporter-1)	12m 31s
arm-unittest-matrix (exporter-2)	6m 42s
arm-unittest-matrix (exporter-3)	7m 22s
arm-unittest-matrix (extension)	7m 22s
arm-unittest-matrix (connector)	6m 32s
arm-unittest-matrix (internal)	8m 28s
arm-unittest-matrix (pkg)	5m 46s
arm-unittest-matrix (cmd-0)	4m 22s
arm-unittest-matrix (cmd-1)	3m 47s
arm-unittest-matrix (other)	6m 39s
arm-unittest	1s
	2h 5m 58s

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