Allow the source of the parent context to be configurable.

[rapphil]

This is to track the upstream work as result of:

https://github.com/open-telemetry/opentelemetry-lambda/issues/714

We need propose a change in the spec to add support to the EventToCarrier abstraction and make it configurable in the lambda instrumentation. The configuration should be used to inform what is the source for generating the carrier that will be used in the instrumentation so that the parent/child relationship is properly created.

References:

• https://github.com/open-telemetry/opentelemetry-specification/issues/3060#issuecomment-1366978529
• https://github.com/open-telemetry/opentelemetry-go-contrib/blob/75d0c13f6129330f3b5b060791aa8cefdc553849/instrumentation/github.com/aws/aws-lambda-go/otellambda/config.go#L114

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