Add release notes for 2.2.0.0 (opensearch-project#730)

Signed-off-by: Joshua Li <[email protected]>

Author: joshuali925

release-notes/opensearch-sql.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
+
+### Features
+* Add match_phrase_prefix ([#661](https://github.com/opensearch-project/sql/pull/661))
+* `query_string` Relevance Function Implementation in SQL and PPL ([#675](https://github.com/opensearch-project/sql/pull/675))
+* Add Highlight In SQL ([#717](https://github.com/opensearch-project/sql/pull/717))
+
+### Enhancements
+* implement transport api for PPL inter-plugin communication ([#533](https://github.com/opensearch-project/sql/pull/533))
+* Two single or double quote escapes single or double quote when string is surrounded by same type of quote ([#696](https://github.com/opensearch-project/sql/pull/696))
+
+### Bug Fixes
+* Reverted UseSSL flag to false and removed invalid test case  ([#671](https://github.com/opensearch-project/sql/pull/671))
+* Update BI connectors and drivers readme files ([#665](https://github.com/opensearch-project/sql/pull/665))
+* Bump moment from 2.29.2 to 2.29.4 in /workbench ([#702](https://github.com/opensearch-project/sql/pull/702))
+
+### Infrastructure
+* Staging for version increment automation ([#684](https://github.com/opensearch-project/sql/pull/684))
+* Update tests and test data for relevancy search functions ([#707](https://github.com/opensearch-project/sql/pull/707))
+* Remove ODFE BWC tests ([#721](https://github.com/opensearch-project/sql/pull/721))
+* Github Actions fix for reference to OpenSearch-Dashboard not existing outside of main OS sql project ([#704](https://github.com/opensearch-project/sql/pull/704))
+
+### Documentation
+* Update support link for Tableau connector ([#643](https://github.com/opensearch-project/sql/pull/643))
+* Fix broken forum link ([#694](https://github.com/opensearch-project/sql/pull/694))
+* Fix links in the doc file. ([#705](https://github.com/opensearch-project/sql/pull/705))
+
+### Maintenance
+* change version bump under maintenance ([#679](https://github.com/opensearch-project/sql/pull/679))
+* Bump version to 2.2.0 ([#729](https://github.com/opensearch-project/sql/pull/729))