Support AWS Lambda@Edge

[borfig]

Is your feature request related to a problem? Please describe.
I want to use Elastic APM in AWS Lambda@Edge functions. However AWS Lambda@Edge does not support layers and environment variables. I can use Elastic APM in regular AWS Lambda functions by following the instructions

Describe the solution you'd like
Instructions on how to bundle the extension inside ZIP, webpack the client library, and manually initialize the APM client would be appreciated.

Describe alternatives you've considered
None.

Additional context
We would like to measure the performance of our Lambda@Edge functions.

[simitt]

Unfortunately we currently only support adding the extension as a layer, with no short term plans of making changes to this. We can keep your request in the backlog for now.