expose command to get current workspace path (#2402)

Signed-off-by: Yan Zhang <yanzh@microsoft.com>

Author: Eskibear

src/commands.ts

@@ -256,4 +256,6 @@ export namespace Commands {
     export const RUNTIME_VALIDATION_OPEN = 'java.runtimeValidation.open';
 
     export const RESOLVE_WORKSPACE_SYMBOL = 'java.project.resolveWorkspaceSymbol';
+
+	export const GET_WORKSPACE_PATH = '_java.workspace.path';
 }

src/extension.ts

@@ -377,6 +377,8 @@ export function activate(context: ExtensionContext): Promise<ExtensionAPI> {
 
 			context.subscriptions.push(commands.registerCommand(Commands.CLEAN_WORKSPACE, () => cleanWorkspace(workspacePath)));
 
+			context.subscriptions.push(commands.registerCommand(Commands.GET_WORKSPACE_PATH, () => workspacePath));
+
 			context.subscriptions.push(onConfigurationChange(workspacePath));
 
 			/**