run test cases in browser

[kt3k]

1. Bundle test entry point.
2. Polyfill Deno.test for browser
   1. Correct test definition using shim-deno-test
   2. Pass them to some browser compatible test runner.
3. Create test bed html file
4. Load the test bed html file in the browser probably using puppeteer or playwright
5. Check the output in the browser

related #641