Adding OE filtering interfaces. (#22738)

* Adding interfaces for tree filtering

* fixing type

* Adding enums in sqlhost

* Fixing comment

* Fixed filters lol

* Fixing some contract definitions

* Removing flag

* Update src/sql/azdata.proposed.d.ts

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

* Removing filters

* Removing filters2

* Fixing enum

* Fixing interface and enum names

* Fixing interface name

* Update src/sql/azdata.proposed.d.ts

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

* Removing type from filter

* Adding is null and is not null operators

* Fixing enums

* Update src/sql/azdata.proposed.d.ts

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

* Update src/sql/azdata.proposed.d.ts

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

* Update src/sql/azdata.proposed.d.ts

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

---------

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

src/sql/workbench/api/common/sqlExtHost.api.impl.ts

@@ -657,6 +657,8 @@ export function createAdsApiFactory(accessor: ServicesAccessor): IAdsExtensionAp
 				FrequencyTypes: sqlExtHostTypes.FrequencyTypes,
 				FrequencySubDayTypes: sqlExtHostTypes.FrequencySubDayTypes,
 				FrequencyRelativeIntervals: sqlExtHostTypes.FrequencyRelativeIntervals,
+				NodeFilterPropertyDataType: sqlExtHostTypes.NodeFilterPropertyDataType,
+				NodeFilterOperator: sqlExtHostTypes.NodeFilterOperator,
 				window,
 				tasks,
 				dashboard,