Integrate Contextualization API into Azure Data Studio to get better query recommendations from Copilot (#24044)

* Boilerplate for new metadata API endpoint

* Register all server metadata provider

* Fully registers data provider

* Registers metadata provider

* Instantiate metadata service

* Generates server metadata when connection is established

* Allow queryEditorInput to get server metadata

* Minor clean up

* Renames metadata provider and request endpoint

* Corrects documentation block

* Integrates get server metadata request endpoint

* Adjusts GetServerMetadataResult scripts type

* Add back Cargo.toml file

* Fix SQL hygiene error

* reflect changes made in in STS for table metadata

* Adds feature toggle to serverMetadataService

* Places toggle before request to get create scripts

* Fix build check issues

* Minor review changes

* Improves contextualization setting label

* Generalize contextualization service names

* Additional code review changes

* Update extensions/mssql/src/contracts.ts

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

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

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

* Code reivew changes

* Capitalize c in contextualization

* Additional review changes

* Update provider type

* Simplify type and method names

* Unregister MSSQL ServerContextualization provider

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

src/sql/platform/query/common/query.ts

@@ -46,6 +46,7 @@ export interface IQueryEditorConfiguration {
 	readonly tabColorMode: 'off' | 'border' | 'fill';
 	readonly showConnectionInfoInTitle: boolean;
 	readonly promptToSaveGeneratedFiles: boolean;
+	readonly githubCopilotContextualizationEnabled: boolean;
 }
 
 export interface IResultGridConfiguration {