Extension - Allow gzip compression of responses

[huntharo]

Motivations

• Compressing response bytes should be optional
• Compressing response bytes in the Lambda minimizes the number of bytes transmitted across AZs and handled by the Router (reducing CPU usage and ENI bandwidth consumption)

References

• Based on PR for aws-lambda-web-adapter:
  • Optional gzip compression of responses aws/aws-lambda-web-adapter#157
• aws-lambda-web-adapter switched to using the Tower Compression layer which appears to support streaming:
  • https://docs.rs/tower-http/latest/tower_http/compression/