add 2.12 release notes (opensearch-project#1152)

Signed-off-by: Kaituo Li <[email protected]>

release-notes/opensearch-anomaly-detection.release-notes-2.12.0.0.md

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+Compatible with OpenSearch 2.12.0.
+
+
+### Enhancements
+* Add an AD transport client ([#1111](https://github.com/opensearch-project/anomaly-detection/pull/1111))
+* Add profile transport action to AD client ([#1123](https://github.com/opensearch-project/anomaly-detection/pull/1123))
+* Refactor client's getDetectorProfile to use GetAnomalyDetectorTransportAction ([#1124](https://github.com/opensearch-project/anomaly-detection/pull/1124))
+* Add ser/deser to get AD transport action request ([#1150](https://github.com/opensearch-project/anomaly-detection/pull/1150))
+
+### Infrastructure
+* Update to Gradle 8.5 ([#1131](https://github.com/opensearch-project/anomaly-detection/pull/1131))
+* Remove default admin credentials ([#1134](https://github.com/opensearch-project/anomaly-detection/pull/1134))
+* Require JDK version for java spotless check ([#1129](https://github.com/opensearch-project/anomaly-detection/pull/1129))
+* Updated lucene snapshot url ([#1146](https://github.com/opensearch-project/anomaly-detection/pull/1146))
+* Fix build, update CVE-affected versions ([#1102](https://github.com/opensearch-project/anomaly-detection/pull/1102))
+