Add 2.10.0 release notes

Signed-off-by: Hailong Cui <[email protected]>

release-notes/opensearch-notifications.release-notes-2.10.0.0.md

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+## Version 2.10.0.0 2023-09-19
+
+Compatible with OpenSearch 2.10.0
+
+### 📈 Features/Enhancements
+* Support SNS FIFO queues([#716](https://github.com/opensearch-project/notifications/pull/716))
+* Supuport Microsoft teams([#676](https://github.com/opensearch-project/notifications/pull/676),[#746](https://github.com/opensearch-project/notifications/pull/746))
+* Support auto upgrade mapping logic([#699](https://github.com/opensearch-project/notifications/pull/699))
+
+### Maintenance
+* [AUTO] Increment version to 2.10.0-SNAPSHOT([#706](https://github.com/opensearch-project/notifications/pull/706))
+
+### Infrastructure
+* Fix core refactor: StreamIO from common to core.common([#707](https://github.com/opensearch-project/notifications/pull/707))
+* Fix core XcontentFactory refactor([#732](https://github.com/opensearch-project/notifications/pull/732))
+* Fix actions components after core([#739](https://github.com/opensearch-project/notifications/pull/739))
+* Add auto release workflow([#731](https://github.com/opensearch-project/notifications/pull/731))
+* Onboarding system and hidden index([#731](https://github.com/opensearch-project/notifications/pull/731))
+
+### Documentation
+* Add 2.10.0 release notes ([#755](https://github.com/opensearch-project/notifications/pull/755))