feat(tracing): support aws xray propagation

[antoine-labarussias-wmx]

This PR adds support for the AWS X-Ray trace propagation header.

Summary

Because Amazon X-Ray uses a custom trace id format, without proper support of the X-Amzn-Trace-Id header, it's not possible to store kong's traces in xray.

Doc about X-Amzn-Trace-Id:
https://docs.aws.amazon.com/xray/latest/devguide/xray-concepts.html#xray-concepts-tracingheader

Existing implementations in JS and Python:

• https://github.com/open-telemetry/opentelemetry-js-contrib/blob/main/propagators/opentelemetry-propagator-aws-xray/src/AWSXRayPropagator.ts
• https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/propagator/opentelemetry-propagator-aws-xray/src/opentelemetry/propagators/aws/aws_xray_propagator.py

Checklist

• The Pull Request has tests
• There's an entry in the CHANGELOG
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - feat(opentelemetry): add AWS header propagation docs.konghq.com#5732

Full changelog

• Implement support for the AWS X-Ray trace header

[CLAassistant]

All committers have signed the CLA.

[hanshuebner]

This change looks good overall, thank you for the contribution! Please see my inline comments and add an entry to CHANGELOG.md. If you could suggest what needs to be added to the documentation (source), it'd be much appreciated.

[antoine-labarussias-wmx]

Thanks for the review, here is the small PR for the documentation: Kong/docs.konghq.com#5732

[samugi]

looks good overall! I just left a couple of minor comments

[outsinre]

cherry-pick to EE?

[GGabriele]

Edit: sorry, wrong repo 🤦