Add release note for 2.4.0 (#185)

Signed-off-by: Heemin Kim <[email protected]>

Signed-off-by: Heemin Kim <[email protected]>

Author: heemin32

release-notes/opensearch-geospatial.release-notes-2.4.0.0.md

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+## Version 2.4.0.0 Release Notes
+
+Compatible with OpenSearch 2.4.0
+
+### Features
+* Support Uber's H3 geospatial indexing system as geohex_grid ([#179](https://github.com/opensearch-project/geospatial/pull/179))
+* Add geojson support for XYPoint  ([#162](https://github.com/opensearch-project/geospatial/pull/162))
+* Add XYPoint Field Type to index and query documents that contains cartesian points ([#130](https://github.com/opensearch-project/geospatial/pull/130))
+* Add XYShapeQueryBuilder ([#82](https://github.com/opensearch-project/geospatial/pull/82))
+* Add parameter to randomly include z coordinates to geometry ([#79](https://github.com/opensearch-project/geospatial/pull/79))
+* Add shape processor ([#74](https://github.com/opensearch-project/geospatial/pull/74))
+* Add shape field mapper ([#70](https://github.com/opensearch-project/geospatial/pull/70))
+* Add ShapeIndexer to create indexable fields ([#68](https://github.com/opensearch-project/geospatial/pull/68))
+
+### Enhancements
+* add groupId to pluginzip publication ([#167](https://github.com/opensearch-project/geospatial/pull/167))
+* Flip X and Y coordinates for WKT and array formats in XYPoint ([#156](https://github.com/opensearch-project/geospatial/pull/156))
+
+### Infrastructure
+* Add window and mac platform in CI ([#173](https://github.com/opensearch-project/geospatial/pull/173))
+* Fix integration test failure with security enabled cluster ([#138](https://github.com/opensearch-project/geospatial/pull/138))
+* Remove explicit dco check ([#126](https://github.com/opensearch-project/geospatial/pull/126))
+* Include feature branch in workflow to trigger CI ([#102](https://github.com/opensearch-project/geospatial/pull/102))
+
+### Maintenance
+* Increment version to 2.4.0-SNAPSHOT ([#139](https://github.com/opensearch-project/geospatial/pull/139))
+* Update to Gradle 7.5.1 ([#134](https://github.com/opensearch-project/geospatial/pull/134))
+
+### Refactoring
+* Remove optional to get features ([#177](https://github.com/opensearch-project/geospatial/pull/177))