Release Notes for 2.2.0 (#920)

Signed-off-by: vamsi-amazon <[email protected]>
(cherry picked from commit 77c460f)

Author: vamsimanohar

release-notes/opensearch-observability.release-notes-2.2.0.0.md

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+## Version 2.2.0.0 Release Notes
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.2.0
+
+### Maintenance
+* Bump version to 2.2.0 ([#918](https://github.com/opensearch-project/observability/pull/918))