Add support for Telemetry API

[RafalSumislawski]

Description of changes:

This PR adds support for the new Telemetry API in parallel to the already supported Logging API.

By submitting this pull request

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I confirm that I've made a best effort attempt to update all relevant documentation.

[calavera]

are there any docs or blog posts about this new API? I have not seen that announcement yet

[calavera]

@RafalSumislawski it'd be awesome if you added an example on how to use this new API in the examples directory: https://github.com/awslabs/aws-lambda-rust-runtime/tree/main/examples

[RafalSumislawski]

I will.

[RafalSumislawski]

It has been announced an hour ago ;)
https://aws.amazon.com/blogs/compute/introducing-the-aws-lambda-telemetry-api/
https://docs.aws.amazon.com/lambda/latest/dg/telemetry-api.html

And we used this library at Coralogix to develop our Telemetry exporter https://serverlessrepo.aws.amazon.com/applications/eu-central-1/597078901540/Coralogix-AWS-Lambda-Telemetry-Exporter

[calavera]

It has been announced an hour ago ;)

that was quick, nice job!

[calavera]

can you fix the clippy issues?

[calavera]

thanks for the contribution, the code looks solid. We should be able to merge it as soon as the CI passes and we have some docs in the README.md for the extension and examples in the examples directory 🙌

[bnusunny]

@RafalSumislawski This looks nice. Thanks for your contribution.

[RafalSumislawski]

I did all the requested changes. No more clippy warnings. The docs and examples are updated. Thanks for the patience ;)

[calavera]

this is awesome, thanks for contributing to the project @RafalSumislawski !