Add exemplars feature (#4094) #88

Job	Run time
opentelemetry-api	39s
opentelemetry-exporter-opencensus	45s
opentelemetry-getting-started	1m 2s
opentelemetry-opencensus-shim	42s
opentelemetry-opentracing-shim	44s
opentelemetry-proto	28s
opentelemetry-sdk	46s
opentelemetry-semantic-conventions	35s
opentelemetry-exporter-otlp-combined	46s
opentelemetry-exporter-otlp-proto-common	47s
opentelemetry-exporter-otlp-proto-grpc	50s
opentelemetry-exporter-otlp-proto-http	51s
opentelemetry-exporter-prometheus	41s
opentelemetry-exporter-zipkin-combined	36s
opentelemetry-exporter-zipkin-json	38s
opentelemetry-exporter-zipkin-proto-http	46s
opentelemetry-propagator-b3	35s
opentelemetry-propagator-jaeger	37s
opentelemetry-test-utils	39s
	13m 27s

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