Adds 2.10.0.0 release notes (opensearch-project#531)

Signed-off-by: Darshit Chanpura <[email protected]>

release-notes/opensearch-common-utils.release-notes-2.10.0.0.md

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+## Version 2.10.0.0 2023-08-31
+
+Compatible with OpenSearch 2.10.0
+
+### Maintenance
+* Upgrade the backport workflow ([#487](https://github.com/opensearch-project/common-utils/pull/487))
+* Updates demo certs used in rest tests ([#518](https://github.com/opensearch-project/common-utils/pull/518))
+
+### Feature
+* common utils to support Microsoft teams in notifications ([#428](https://github.com/opensearch-project/common-utils/pull/428))
+* support list of monitor ids in Chained Monitor Findings ([#514](https://github.com/opensearch-project/common-utils/pull/514))
+
+### Documentation
+* Added 2.10.0.0 release notes ([#531](https://github.com/opensearch-project/common-utils/pull/531))