OpenTelemetry Middleware Proposal

OpenTelemetry is becoming a popular open-source solution for monitoring application performance. Well-defined semantic conventions are supplied for HTTP metrics and traces. See here: https://opentelemetry.io/docs/specs/semconv/http/

In following with their guidance on instrumentation, they recommend implementing instrumentation code in the library for which it is written: https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/instrumentation#new-instrumentation

If interested, I would be willing to contribute instrumentation code that implements OpenTelemetry metrics and tracing as a middleware for `chi`. Please let me know if you would like me to proceed with opening a PR.

Thanks.

p.s. thank you for `chi`, using it is a great experience

Start with the linked OpenTelemetry HTTP semantic conventions and opentelemetry-go-contrib instrumentation guidance, then confirm the desired chi middleware scope with maintainers. Done means an agreed design for metrics and tracing middleware and a submitted implementation PR.

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