Extensibility: Context menu support in Object Explorer (#1883)

- Fixes #1867 context menu should be extensible
- Added context keys to support "when" conditions on the new extensions
- Fixes issue where actions like New Query, scripting show up even if these are not valid for the provider type or object type
- Fixed node expansion bug where rapid connect / expand / disconnect could break the app (fix in ObjectExplorerService.onNodeExpanded)
- Major change to how internal actions work. These cannot assume the context has non-serializable objects. Opened up some APIs to make this easier to handle.
- Fixed a number of existing bugs in internal actions.
  - Notably, DisconnectAction was adding a listener on each right-click on an active connection and never getting it disposed. This wasn't needed at all due to design changes.
  - Another bug fix is that the Manage action now correctly navigates to the DB dashboard for database-level connections. Before this it went to the server-level dashboard.

* Define API for context info

src/sql/services/bootstrap/bootstrapParams.ts

@@ -6,7 +6,7 @@
 import { DataService } from 'sql/parts/grid/services/dataService';
 import { IConnectionProfile } from 'sql/parts/connection/common/interfaces';
 import { IContextKeyService, IContextKey } from 'vs/platform/contextkey/common/contextkey';
-import { ConnectionContextkey } from 'sql/parts/connection/common/connectionContextKey';
+import { ConnectionContextKey } from 'sql/parts/connection/common/connectionContextKey';
 import { IBootstrapParams } from './bootstrapService';
 
 export interface IQueryComponentParams extends IBootstrapParams {
@@ -21,7 +21,7 @@ export interface IDefaultComponentParams extends IBootstrapParams {
 	connection: IConnectionProfile;
 	ownerUri: string;
 	scopedContextService: IContextKeyService;
-	connectionContextKey: ConnectionContextkey;
+	connectionContextKey: ConnectionContextKey;
 }
 
 export interface IDashboardComponentParams extends IDefaultComponentParams {

src/sql/services/common/commonServiceInterface.service.ts

@@ -17,7 +17,7 @@ import { IAdminService } from 'sql/parts/admin/common/adminService';
 import { IQueryManagementService } from 'sql/parts/query/common/queryManagement';
 import { IConnectionProfile } from 'sql/parts/connection/common/interfaces';
 import { AngularDisposable } from 'sql/base/common/lifecycle';
-import { ConnectionContextkey } from 'sql/parts/connection/common/connectionContextKey';
+import { ConnectionContextKey } from 'sql/parts/connection/common/connectionContextKey';
 
 import { ProviderMetadata, DatabaseInfo, SimpleExecuteResult } from 'sqlops';
 
@@ -47,7 +47,7 @@ export class SingleConnectionManagementService {
 	constructor(
 		private _connectionService: IConnectionManagementService,
 		private _uri: string,
-		private _contextKey: ConnectionContextkey
+		private _contextKey: ConnectionContextKey
 	) { }
 
 	public changeDatabase(name: string): Thenable<boolean> {
@@ -104,7 +104,7 @@ export class CommonServiceInterface extends AngularDisposable {
 	protected _singleQueryManagementService: SingleQueryManagementService;
 	public scopedContextKeyService: IContextKeyService;
 
-	protected _connectionContextKey: ConnectionContextkey;
+	protected _connectionContextKey: ConnectionContextKey;
 
 	constructor(
 		@Inject(IBootstrapParams) protected _params: IDefaultComponentParams,

src/sql/services/scripting/scriptingService.ts

@@ -25,6 +25,11 @@ export interface IScriptingService {
 	 */
 	registerProvider(providerId: string, provider: sqlops.ScriptingProvider): void;
 
+	/**
+	 * Specifies whether a provider with a given ID has been registered or not
+	 */
+	isProviderRegistered(providerId: string): boolean;
+
 	/**
 	 * Callback method for when scripting is complete
 	 */
@@ -99,6 +104,11 @@ export class ScriptingService implements IScriptingService {
 		this._providers[providerId] = provider;
 	}
 
+	public isProviderRegistered(providerId: string): boolean {
+		let provider = this._providers[providerId];
+		return !!provider;
+	}
+
 	public dispose(): void {
 		this.disposables = dispose(this.disposables);
 	}