Add repr to all classes #92

Job	Run time
opentelemetry-api	43s
opentelemetry-exporter-opencensus	46s
opentelemetry-exporter-otlp-combined	47s
opentelemetry-exporter-otlp-proto-common	46s
opentelemetry-exporter-otlp-proto-grpc	52s
opentelemetry-exporter-otlp-proto-http	51s
opentelemetry-exporter-prometheus	40s
opentelemetry-exporter-zipkin-combined	45s
opentelemetry-exporter-zipkin-json	43s
opentelemetry-exporter-zipkin-proto-http	48s
opentelemetry-getting-started	1m 3s
opentelemetry-opencensus-shim	44s
opentelemetry-opentracing-shim	44s
opentelemetry-sdk	49s
opentelemetry-proto	32s
opentelemetry-semantic-conventions	36s
opentelemetry-propagator-b3	38s
opentelemetry-test-utils	44s
opentelemetry-propagator-jaeger	39s
	14m 10s

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