[Proposal] Monitor echo with https://github.com/alibaba/opentelemetry-go-auto-instrumentation

[123liuziming]

I found that echo doesn't have the ability to integrate tracing and metrics by default and there doesn't seem to be a best practice in the documentation on how to monitor echo applications. Our project(https://github.com/alibaba/opentelemetry-go-auto-instrumentation) allows tracing and metrics(will be supported later) to be collected and reported on the echo app without making changes to user code. I was wondering if it would be possible for me to add an observable subsection to the official documentation for this project that describes best practices for observing the echo application. Thanks!