Remove handling of promises + fix issues connecting unrelated traces #50
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We don't need to handle promises here because coralogix/opentelemetry-js-contrib#19 will convert promise based handlers to callback based.
The change to use ROOT_CONTEXT basically means that when we don't receive any trace information in the request, then we start a new trace. The previous code would in some edge cases reuse leftover trace context from previous invocation which doesn't make sense.