Sidartha Gracias

## Which problem is this PR solving? Add optional forceFlush property to SpanExporter interface per spec Fixes #3067 ## Short description of the changes ## Type of change - [x]...

**Describe the bug** The lambda instrumentation layer provides a way to pass a configuration function to @opentelemetry/instrumentation-aws-lambda ([link](https://github.com/open-telemetry/opentelemetry-lambda/blob/main/nodejs/packages/layer/src/wrapper.ts#L68)). However it is not clear how the user would provide such a...