Use namespace commands for refactor keys (microsoft#5166)

The constants for both refactor commands were not used. The string literal itself was referenced in the refactor provider, so I changed it to the command constant. I also fixed the typo in `refactor`

Author: AllanWang

news/3 Code Health/5204.md

@@ -0,0 +1,2 @@
+Fix typo and use constants instead of hardcoded command names.
+(thanks [Allan Wang](https://github.com/AllanWang))

src/client/common/constants.ts

@@ -38,7 +38,7 @@ export namespace Commands {
  export const Tests_Select_And_Run_File = 'python.selectAndRunTestFile';
  export const Tests_Run_Current_File = 'python.runCurrentTestFile';
  export const Refactor_Extract_Variable = 'python.refactorExtractVariable';
- export const Refaactor_Extract_Method = 'python.refactorExtractMethod';
+ export const Refactor_Extract_Method = 'python.refactorExtractMethod';
  export const Update_SparkLibrary = 'python.updateSparkLibrary';
  export const Build_Workspace_Symbols = 'python.buildWorkspaceSymbols';
  export const Start_REPL = 'python.startREPL';

src/client/providers/simpleRefactorProvider.ts

@@ -1,4 +1,5 @@
 import * as vscode from 'vscode';
+import { Commands } from '../common/constants';
 import { getTextEditsFromPatch } from '../common/editor';
 import { IConfigurationService, IInstaller, Product } from '../common/types';
 import { StopWatch } from '../common/utils/stopWatch';
@@ -15,7 +16,7 @@ let installer: IInstaller;
 
 export function activateSimplePythonRefactorProvider(context: vscode.ExtensionContext, outputChannel: vscode.OutputChannel, serviceContainer: IServiceContainer) {
  installer = serviceContainer.get<IInstaller>(IInstaller);
- let disposable = vscode.commands.registerCommand('python.refactorExtractVariable', () => {
+ let disposable = vscode.commands.registerCommand(Commands.Refactor_Extract_Variable, () => {
  const stopWatch = new StopWatch();
  const promise = extractVariable(context.extensionPath,
  vscode.window.activeTextEditor!,
@@ -26,7 +27,7 @@ export function activateSimplePythonRefactorProvider(context: vscode.ExtensionCo
  });
  context.subscriptions.push(disposable);
 
- disposable = vscode.commands.registerCommand('python.refactorExtractMethod', () => {
+ disposable = vscode.commands.registerCommand(Commands.Refactor_Extract_Method, () => {
  const stopWatch = new StopWatch();
  const promise = extractMethod(context.extensionPath,
  vscode.window.activeTextEditor!,