Add 2.10 release notes (#1031)

Signed-off-by: Jackie Han <[email protected]>

release-notes/opensearch-anomaly-detection.release-notes-2.10.0.0.md

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+Compatible with OpenSearch 2.10.0.
+
+### Refactor
+
+* Refactor due to core updates: Replace and modify classes and methods. ([#974](https://github.com/opensearch-project/anomaly-detection/pull/974))
+
+
+### Enhancements
+* Defaults anomaly grade to 0 if negative. ([#977](https://github.com/opensearch-project/anomaly-detection/pull/977))
+* Update RCF to v3.8 and Enable Auto AD with 'Alert Once' Option ([#979](https://github.com/opensearch-project/anomaly-detection/pull/979))
+* Revert "Enforce DOCUMENT Replication for AD Indices" ([#1006](https://github.com/opensearch-project/anomaly-detection/pull/1006))
+
+### Infrastructure
+
+* Adds auto release workflow ([#1003](https://github.com/opensearch-project/anomaly-detection/pull/1003))
+* upgrading commons-lang3 version to fix conflict issue ([#1014](https://github.com/opensearch-project/anomaly-detection/pull/1014))
+* Updates demo certs for integ tests ([#1021](https://github.com/opensearch-project/anomaly-detection/pull/1021))
+* Upgrade AD's bwc baseline version to 1.3.2 to resolve cluster join issue ([#1029](https://github.com/opensearch-project/anomaly-detection/pull/1029))
+