Feature/viewlet cmsapis (#4312)

* first set of changes to experiment the registration of cms related apis

* Adding cms service entry to workbench

* Adding basic functionality for add remove reg servers and group

* Returning relative path as part of RegServerResult as string

* Removing the cms apis from core. Having mssql extension expose them for cms extension

* Propogating the backend name changes to apis

* Fixing some missing sqlops references

* Adding a sqltools service version with CMS apis available

extensions/mssql/src/features.ts

@@ -12,6 +12,7 @@ import * as contracts from './contracts';
 import * as azdata from 'azdata';
 import * as Utils from './utils';
 import * as UUID from 'vscode-languageclient/lib/utils/uuid';
+import { ConnectParams } from 'dataprotocol-client/lib/protocol';
 
 export class TelemetryFeature implements StaticFeature {
 
@@ -672,4 +673,4 @@ export class AgentServicesFeature extends SqlOpsFeature<undefined> {
 			registerOnUpdated
 		});
 	}
-}
+}