Make enabled fields volatile in SdkTracer, SdkMeter, and MetricStorage implementations#95

trask merged 2 commits intovolatiletrask/opentelemetry-java:volatilefrom

copilot/fix-de9e7177-fc58-493c-adde-10ae5da2915atrask/opentelemetry-java:copilot/fix-de9e7177-fc58-493c-adde-10ae5da2915aCopy head branch name to clipboard