add API command vscode.executeInlineHintProvider and some end-to-end tests

src/vs/workbench/api/common/extHostApiCommands.ts

@@ -271,6 +271,14 @@ const newCommands: ApiCommand[] = [
 			return [];
 		})
 	),
+	// --- inline hints
+	new ApiCommand(
+		'vscode.executeInlineHintProvider', '_executeInlineHintProvider', 'Execute inline hints provider',
+		[ApiCommandArgument.Uri, ApiCommandArgument.Range],
+		new ApiCommandResult<modes.InlineHint[], vscode.InlineHint[]>('A promise that resolves to an array of InlineHint objects', result => {
+			return result.map(typeConverters.InlineHint.to);
+		})
+	),
 	// --- notebooks
 	new ApiCommand(
 		'vscode.resolveNotebookContentProviders', '_resolveNotebookContentProvider', 'Resolve Notebook Content Providers',