Propose messaging semconv stability working group

Author: pyohannes

projects/messaging-semconv.md

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+# Messaging Semantic Convention Stability
+
+## Description
+
+Get the messaging semantic conventions for metrics and traces to stability, and
+afterwards update existing messaging instrumentation across all OpenTelemetry
+repositories to conform with the stable conventions.
+
+## Deliverables
+
+* Mark the messaging semantic conventions as stable.
+* Update existing messaging instrumentation across all OpenTelemetry
+  repositories to conform with the stable conventions.
+
+## Staffing / Help Wanted
+
+Project lead
+
+* @pyohannes
+
+TC sponsor
+
+* @carlosalberto
+
+Domain experts
+
+* @dpauls
+* @joaograssi
+* @lmolkova
+
+Maintainers, approvers, and engineers willing to prototype and review
+
+* TBD
+
+## Meeting Times
+
+We will keep the [established meeting at 8 AM PST](https://github.com/open-telemetry/community?tab=readme-ov-file#specification-sigs).
+
+## Timeline
+
+Goal is to stabilize messaging semantic conventions in the first half of 2024.
+
+## Project Board
+
+* [Stability blockers](https://github.com/orgs/open-telemetry/projects/20/views/1)
+* [Backlog](https://github.com/orgs/open-telemetry/projects/20/views/4)