Adding group by schema to OE (#21941)

* Adding group by schema and updating schema icon

* Adding item context menu

* Fixing command logic

* Adding telemetry for group by and changing default config

* reverting no child nodes error message

* Code cleanup

* Cleaning up constants

* Removing unused imports

* Update extensions/mssql/src/main.ts

Co-authored-by: Charles Gagnon <chgagnon@microsoft.com>

* converting to sendActionEvent

* sendActionEvent

* Adding telemetryViews and telemetry actions

* Fixing localized string

* registering context

---------

Co-authored-by: Charles Gagnon <chgagnon@microsoft.com>

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