Add release notes for 2.9 (#1857)

Signed-off-by: Max Ksyunz <max.ksyunz@improving.com>
(cherry picked from commit e186cf7)

release-notes/opensearch-sql.release-notes-2.9.0.0.md

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+Compatible with OpenSearch and OpenSearch Dashboards Version 2.9.0
+
+### Features
+
+* Enable Table Function and PromQL function ([#1719](https://github.com/opensearch-project/sql/pull/1719))
+* Add spark connector ([#1780](https://github.com/opensearch-project/sql/pull/1780))
+
+### Enhancements
+
+* Pagination: Support WHERE clause, column list in SELECT clause and for functions and expressions in the query ([#1500](https://github.com/opensearch-project/sql/pull/1500))
+* Pagination: Support ORDER BY clauses and queries without FROM clause ([#1599](https://github.com/opensearch-project/sql/pull/1599))
+* Remove backticks on by field in stats ([#1728](https://github.com/opensearch-project/sql/pull/1728))
+* Support Array and ExprValue Parsing With Inner Hits ([#1737](https://github.com/opensearch-project/sql/pull/1737))
+* Add Support for Nested Function in Order By Clause ([#1789](https://github.com/opensearch-project/sql/pull/1789))
+* Add Support for Field Star in Nested Function ([#1773](https://github.com/opensearch-project/sql/pull/1773))
+* Guarantee datasource read api is strong consistent read (compatibility with segment replication) ([#1815](https://github.com/opensearch-project/sql/pull/1815))
+* Added new datetime functions and aliases to PPL ([#1807](https://github.com/opensearch-project/sql/pull/1807))
+* Support user-defined and incomplete date formats ([#1821](https://github.com/opensearch-project/sql/pull/1821))
+* Add _routing to SQL includes list ([#1771](https://github.com/opensearch-project/sql/pull/1771))
+* Disable read of plugins.query.datasources.encryption.masterkey from cluster settings GET API ([#1825](https://github.com/opensearch-project/sql/pull/1825))
+* Add EMR client to spark connector ([#1790](https://github.com/opensearch-project/sql/pull/1790))
+* Improved error codes in case of data sourcde API security exception ([#1753](https://github.com/opensearch-project/sql/pull/1753))
+* Remove Default master encryption key from settings ([#1851](https://github.com/opensearch-project/sql/pull/1851))
+
+### Bug Fixes
+
+* Fixed bug of byte/short not handling 0 denominator in divide/modulus equations ([#1716](https://github.com/opensearch-project/sql/pull/1716))
+* Fix CSV/RAW output header being application/json rather than plain/text ([#1779](https://github.com/opensearch-project/sql/pull/1779))
+
+### Documentation
+
+* Updated documentation of round function return type ([#1725](https://github.com/opensearch-project/sql/pull/1725))
+* Updated `protocol.rst` with new wording for error message ([#1662](https://github.com/opensearch-project/sql/pull/1662))
+
+### Infrastructure
+
+* stopPrometheus task in doctest build.gradle now runs upon project failure in startOpenSearch ([#1747](https://github.com/opensearch-project/sql/pull/1747))
+* Upgrade guava to 32.0.1
+* Disable CrossClusterSearchIT test ([#1814](https://github.com/opensearch-project/sql/pull/1814))
+* fix flakytest when tests.locale=tr ([#1827](https://github.com/opensearch-project/sql/pull/1827))
+
+### Refactoring
+
+* Simplify OpenSearchIndexScanBuilder ([#1738](https://github.com/opensearch-project/sql/pull/1738))