Add CHANGELOG

Author: xrmx

CHANGELOG.md

@@ -16,6 +16,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   to crash at shutdown with a max recursion error ([#4586](https://github.com/open-telemetry/opentelemetry-python/pull/4586)).
 - Configurable max retry timeout for grpc exporter
   ([#4333](https://github.com/open-telemetry/opentelemetry-python/pull/4333))
+- opentelemetry-api: allow importlib-metadata 8.7.0
+  ([#4593](https://github.com/open-telemetry/opentelemetry-python/pull/4593))
 
 ## Version 1.33.0/0.54b0 (2025-05-09)