feat(aws-lambda): Add trace headers to aws_lambda instrumentation

[sam-mosleh]

Description

Automatically inject trace headers in AWS Lambda responses. Fixes #4074

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• [x] By checking existence of those headers

Does This PR Require a Core Repo Change?

• [x] No.