Add Release Notes for v2.10.0 (#540)

release-notes/opensearch-performance-analyzer.release-notes-2.10.0.0.md

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+## Version 2.10.0 Release Notes
+
+Compatible with OpenSearch 2.10.0
+
+### Enhancements
+* Add Search Back Pressure Autotune Pipeline [#517](https://github.com/opensearch-project/performance-analyzer/pull/517)
+* SearchBackPressure Service Node/Cluster RCA [#437](https://github.com/opensearch-project/performance-analyzer-rca/pull/437)
+* SearchBackPressure Policy/Decider Generic Framework Added [#461](https://github.com/opensearch-project/performance-analyzer-rca/pull/461)
+* Handle Reader thread termination gracefully [#476](https://github.com/opensearch-project/performance-analyzer-rca/pull/476)
+
+### Infrastructure
+* Update BWC version to 2.9.0 [#529](https://github.com/opensearch-project/performance-analyzer/pull/529)
+* Update performance-analyzer-commons library version [#537](https://github.com/opensearch-project/performance-analyzer/pull/446)
+* Upgrade gRPC protobug to mitigate connection termination issue [#471](https://github.com/opensearch-project/performance-analyzer-rca/pull/471)
+
+
+### Maintenance
+* Address core refactor changes for Task foundation classes and StreamIO [#522](https://github.com/opensearch-project/performance-analyzer/pull/522)
+* Address xcontent changes in core [#526](https://github.com/opensearch-project/performance-analyzer/pull/526)
+* Remove usage of deprecated "master" APIs [#513](https://github.com/opensearch-project/performance-analyzer/pull/513)
+* Update docker-compose.yml [#465](https://github.com/opensearch-project/performance-analyzer-rca/pull/465)