Prepare for 1.24.0 release (#57)

* Prepare changelog for 1.24.0 release

* Reformat

CHANGELOG.md

@@ -2,6 +2,39 @@
 
 ## Unreleased
 
+**NOTICE:** This release contains a significant restructuring of this repository and the generated
+classes as we evolve it towards a first stable artifact (although there is no stable artifact as of
+this release). Please read the notes carefully and refer to the PRs and associated issues for more
+details. Additionally, the [README](README.md) contains useful information that should be reviewed.
+
+* BREAKING: Split out incubating artifact. This repo now
+  publishes `io.opentelemetry.semconv:opentelemetry-semconv:{{version}}` for semantic conventions
+  which are stable (the artifact itself is not yet stable but we aim to stabilize eventually),
+  and `io.opentelemetry.semconv:opentelemetry-semconv-incubating:{{version}}` for semantic
+  conventions which are incubating (experimental) (this artifact will always have the `-alpha`
+  designation). As a part of this restructuring, old attributes which do not exist
+  in [semantic-conventions](https://github.com/open-telemetry/semantic-conventions), but which we
+  had retained manually with deprecated annotations, have been removed.
+  ([#41](https://github.com/open-telemetry/semantic-conventions-java/pull/41))
+* BREAKING: Generate classes by root namespace. Where previously all attributes were contained in
+  two classes, `ResourceAttributes` and `SemanticAttributes`, they are now organized by their root
+  namespace. For example, the `http.request.header` attribute lives in `HttpAttributes`.
+  ([#45](https://github.com/open-telemetry/semantic-conventions-java/pull/45))
+* Fix typo in readme
+  ([#42](https://github.com/open-telemetry/semantic-conventions-java/pull/42))
+* Encode semconv version in build dir to fix build cache
+  ([#51](https://github.com/open-telemetry/semantic-conventions-java/pull/51))
+* Cleanup enum generation
+  ([#52](https://github.com/open-telemetry/semantic-conventions-java/pull/52))
+* Update readme to reflect new artifact strategy
+  ([#53](https://github.com/open-telemetry/semantic-conventions-java/pull/53))
+* Use build-tools release 0.24.0
+  ([#55](https://github.com/open-telemetry/semantic-conventions-java/pull/55))
+* Exclude namespaces that aren't useful in jvm environments
+  ([#54](https://github.com/open-telemetry/semantic-conventions-java/pull/54))
+* Update to `semantic-conventions` 1.24.0
+  ([#46](https://github.com/open-telemetry/semantic-conventions-java/pull/46))
+
 ## Version 1.23.1 (2023-11-21)
 
 * Extended jinja template to generate template-type semantic attributes.