docs: add tracing-etw to Related Crates (#1635)

This PR adds tracing-etw which is a new crate.

* Update README.md

* Update lib.rs

README.md

@@ -401,6 +401,7 @@ are not maintained by the `tokio` project. These include:
 - [`tracing-tracy`] provides a way to collect [Tracy] profiles in instrumented
   applications.
 - [`tracing-elastic-apm`] provides a layer for reporting traces to [Elastic APM].
+- [`tracing-etw`] provides a layer for emitting Windows [ETW] events.
 
 (if you're the maintainer of a `tracing` ecosystem crate not in this list,
 please let us know!)
@@ -431,6 +432,8 @@ please let us know!)
 [Tracy]: https://github.com/wolfpld/tracy
 [`tracing-elastic-apm`]: https://crates.io/crates/tracing-elastic-apm
 [Elastic APM]: https://www.elastic.co/apm
+[`tracing-etw`]: https://github.com/microsoft/tracing-etw
+[ETW]: https://docs.microsoft.com/en-us/windows/win32/etw/about-event-tracing
 
 **Note:** that some of the ecosystem crates are currently unreleased and
 undergoing active development. They may be less stable than `tracing` and

tracing/src/lib.rs

@@ -737,6 +737,7 @@
 //!  - [`tracing-tracy`] provides a way to collect [Tracy] profiles in instrumented
 //!    applications.
 //!  - [`tracing-elastic-apm`] provides a layer for reporting traces to [Elastic APM].
+//!  - [`tracing-etw`] provides a layer for emitting Windows [ETW] events.
 //!
 //! If you're the maintainer of a `tracing` ecosystem crate not listed above,
 //! please let us know! We'd love to add your project to the list!
@@ -765,6 +766,8 @@
 //! [Tracy]: https://github.com/wolfpld/tracy
 //! [`tracing-elastic-apm`]: https://crates.io/crates/tracing-elastic-apm
 //! [Elastic APM]: https://www.elastic.co/apm
+//! [`tracing-etw`]: https://github.com/microsoft/tracing-etw
+//! [ETW]: https://docs.microsoft.com/en-us/windows/win32/etw/about-event-tracing
 //!
 //! <pre class="ignore" style="white-space:normal;font:inherit;">
 //!     <strong>Note</strong>: Some of these ecosystem crates are currently