Update CHANGELOG.md for 24.12.0 release (hyperledger#7996)

Update CHANGELOG.md for 24.12.0 release

Signed-off-by: Jason Frame <[email protected]>

CHANGELOG.md

@@ -1,6 +1,25 @@
 # Changelog
 
-## [Unreleased]
+## Unreleased
+
+### Breaking Changes
+
+### Upcoming Breaking Changes
+- Plugin API will be deprecating the BesuContext interface to be replaced with the ServiceManager interface.
+- `MetricSystem::createLabelledGauge` is deprecated and will be removed in a future release, replace it with `MetricSystem::createLabelledSuppliedGauge`
+- k8s (KUBERNETES) Nat method is now deprecated and will be removed in a future release
+- `--host-whitelist` has been deprecated in favor of `--host-allowlist` since 2020 and will be removed in a future release
+- Sunsetting features - for more context on the reasoning behind the deprecation of these features, including alternative options, read [this blog post](https://www.lfdecentralizedtrust.org/blog/sunsetting-tessera-and-simplifying-hyperledger-besu)
+  - Tessera privacy
+  - Smart-contract-based (onchain) permissioning
+  - Proof of Work consensus
+  - Fast Sync
+
+### Additions and Improvements
+
+### Bug fixes
+
+## 24.12.0
 
 ### Breaking Changes
 - Removed Retesteth rpc service and commands [#7833](https://github.com/hyperledger/besu/pull/7783)