[Spanmetrics] - Add exemplars to events_total metric (#29090) #64

Job	Run time
windows-unittest-matrix (receiver-0)	23m 52s
windows-unittest-matrix (receiver-1)	21m 7s
windows-unittest-matrix (processor)	13m 43s
windows-unittest-matrix (exporter)	28m 27s
windows-unittest-matrix (extension)	16m 33s
windows-unittest-matrix (internal)	12m 22s
windows-unittest-matrix (pkg)	11m 20s
windows-unittest-matrix (cmd)	26m 41s
windows-unittest-matrix (other)	20m 36s
windows-unittest	4s
	2h 54m 45s

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