Add release notes for 2.18

Signed-off-by: Chen Dai <[email protected]>

Author: dai-chen

release-notes/opensearch-sql.release-notes-2.18.0.0.md

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+Compatible with OpenSearch and OpenSearch Dashboards Version 2.18.0
+
+### Features
+
+* [Backport 2.18] [Manual Backport] Backport #2981 to 2.x ([#3111](https://github.com/opensearch-project/sql/pull/3111))
+
+### Bug Fixes
+
+* [Backport 2.18] Improve error handling for some more edge cases ([#3112](https://github.com/opensearch-project/sql/pull/3112))
+* [Backport 2.18] [Backport 2.x] Resolve Alias Issues in Legacy SQL with Filters ([#3109](https://github.com/opensearch-project/sql/pull/3109))
+* [Backport 2.18] [Backport 2.x] Bug Fixes for minor issues with SQL PIT refactor ([#3108](https://github.com/opensearch-project/sql/pull/3108))
+* [Backport 2.18] Correct regular expression range ([#3107](https://github.com/opensearch-project/sql/pull/3107))
+* [Backport 2.18] SQL pagination should work with the `pretty` parameter ([#3106](https://github.com/opensearch-project/sql/pull/3106))
+* [Backport 2.x] Improve error handling for malformed query cursors ([#3084](https://github.com/opensearch-project/sql/pull/3084))
+* [Backport 2.x] Remove scheduler index from SystemIndexDescriptor ([#3097](https://github.com/opensearch-project/sql/pull/3097))
+
+### Maintenance
+
+* [Backport 2.x] bump commons-io to 2.14.0 ([#3091](https://github.com/opensearch-project/sql/pull/3091))
+* Fix tests on 2.18 ([#3113](https://github.com/opensearch-project/sql/pull/3113))