Add release notes for v2.16.0 (#2854) (#2861)

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(cherry picked from commit a5ede64)

Signed-off-by: Chen Dai <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

release-notes/opensearch-sql.release-notes-2.16.0.0.md

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+Compatible with OpenSearch and OpenSearch Dashboards Version 2.16.0
+
+### Enhancements
+* Added Setting to Toggle Data Source Management Code Paths ([#2811](https://github.com/opensearch-project/sql/pull/2811))
+* Span in PPL statsByClause could be specified after fields ([#2810](https://github.com/opensearch-project/sql/pull/2810))
+* Updating Grammer changes same as main branch ([#2850](https://github.com/opensearch-project/sql/pull/2850))
+
+### Bug Fixes
+* Temp use of older nodejs version before moving to Almalinux8 ([#2816](https://github.com/opensearch-project/sql/pull/2816))
+* Fix yaml errors causing checks not to be run ([#2823](https://github.com/opensearch-project/sql/pull/2823))
+* Well format the raw response when query parameter "pretty" enabled ([#2829](https://github.com/opensearch-project/sql/pull/2829))
+* Add support for custom date format and openSearch date format for date fields as part of Lucene query ([#2762](https://github.com/opensearch-project/sql/pull/2762))
+* Fix SparkExecutionEngineConfigClusterSetting deserialize issue ([#2838](https://github.com/opensearch-project/sql/pull/2838))
+* Fix SparkSubmitParameterModifier issue ([#2837](https://github.com/opensearch-project/sql/pull/2837))
+
+### Infrastructure
+* Increment version to 2.16.0-SNAPSHOT ([#2743](https://github.com/opensearch-project/sql/pull/2743))
+* Fix checkout action failure ([#2819](https://github.com/opensearch-project/sql/pull/2819))
+* Fix MacOS workflow failure ([#2831](https://github.com/opensearch-project/sql/pull/2831))
+
+### Refactoring
+* Change DataSourceType from enum to class ([#2746](https://github.com/opensearch-project/sql/pull/2746))
+* Fix code style issue ([#2745](https://github.com/opensearch-project/sql/pull/2745))
+* Scaffold async-query-core and async-query module ([#2751](https://github.com/opensearch-project/sql/pull/2751))
+* Move classes from spark to async-query-core and async-query ([#2750](https://github.com/opensearch-project/sql/pull/2750))
+* Exclude integ-test, doctest and download task when built offline ([#2763](https://github.com/opensearch-project/sql/pull/2763))
+* Abstract metrics to reduce dependency to legacy ([#2768](https://github.com/opensearch-project/sql/pull/2768))
+* Remove AsyncQueryId ([#2769](https://github.com/opensearch-project/sql/pull/2769))
+* Add README to async-query-core ([#2770](https://github.com/opensearch-project/sql/pull/2770))
+* Separate build and validateAndBuild method in DataSourceMetadata ([#2752](https://github.com/opensearch-project/sql/pull/2752))
+* Abstract FlintIndex client ([#2771](https://github.com/opensearch-project/sql/pull/2771))
+* Fix statement to store requested langType ([#2779](https://github.com/opensearch-project/sql/pull/2779))
+* Push down OpenSearch specific exception handling ([#2782](https://github.com/opensearch-project/sql/pull/2782))
+* Implement integration test for async-query-core ([#2785](https://github.com/opensearch-project/sql/pull/2785))
+* Fix SQLQueryUtils to extract multiple tables ([#2791](https://github.com/opensearch-project/sql/pull/2791))
+* Eliminate dependency from async-query-core to legacy ([#2792](https://github.com/opensearch-project/sql/pull/2792))
+* Pass accountId to EMRServerlessClientFactory.getClient ([#2822](https://github.com/opensearch-project/sql/pull/2822))
+* Register system index descriptors through SystemIndexPlugin.getSystemIndexDescriptors ([#2817](https://github.com/opensearch-project/sql/pull/2817))
+* Introduce SparkParameterComposerCollection ([#2824](https://github.com/opensearch-project/sql/pull/2824))