Webpack 5 support with updated packages (#131)

- Update to Webpack 5
- Use @effortlessmotion dynamic html and inline source plugins
- Remove .clasp.json and use SAMPLE file
- Consistent prettier formatting throughout
- Update packages to latest versions

Co-authored-by: Kevin Malakoff <kmalakoff@gmail.com>

test/puppeteer-environment.js

@@ -6,11 +6,15 @@ const { readFile } = require('fs').promises;
 const os = require('os');
 const path = require('path');
 const puppeteer = require('puppeteer');
-const NodeEnvironment = require('jest-environment-node');
+const NodeEnvironment = require('jest-environment-node').default;
 
 const DIR = path.join(os.tmpdir(), 'jest_puppeteer_global_setup');
 
 class PuppeteerEnvironment extends NodeEnvironment {
+  constructor(config) {
+    super(config);
+  }
+
   async setup() {
     await super.setup();
     // get the wsEndpoint