feat: add name for plugins (#13826)

Useful for debugging and eventually for reporters to give status updates on which phase of which plugin they are currently running.

docs/src/test-api/class-testplugin.md

@@ -1,6 +1,9 @@
 # class: TestPlugin
 * langs: js
 
+## property: TestPlugin.name
+- type: <[string]>
+
 ## optional async method: TestPlugin.configure
 ### param: TestPlugin.configure.config
 - `config` <[TestConfig]>

packages/playwright-test/src/plugins/vitePlugin.ts

@@ -35,6 +35,8 @@ export function createPlugin(
   const port = options.port || 3100;
   let configDir: string;
   return {
+    name: 'playwright-vite-plugin',
+
     configure: async (config: PlaywrightTestConfig, configDirectory: string) => {
       configDir = configDirectory;
       const url = `http://localhost:${port}/playwright/index.html`;

packages/playwright-test/types/test.d.ts

@@ -3638,6 +3638,8 @@ export interface TestError {
 }
 
 export interface TestPlugin {
+  name: string;
+
   /**
    * @param config
    * @param configDir

tests/config/experimental.d.ts

@@ -20091,6 +20091,8 @@ export interface TestError {
 }
 
 export interface TestPlugin {
+  name: string;
+
   /**
    * @param config
    * @param configDir