Support Headless Mode

[osis]

Is your feature request related to a problem? Please describe.
When developing for a project and using a test runner's --watch mode, chromium and wallet popup windows constantly get in the way of typing.

Describe the solution you'd like
Would like dappwright to take advantage of Playwright's headless mode to make this more of a seamless experience.

Additional context
I've tried flipping the flag to true and running the tests. The behaviour of playwright seems to change because it hangs waiting for the Metamask window.

browserContext.waitForEvent: Timeout 30000ms exceeded while waiting for event "page"

      25 |   const wallet = getWalletType(id);
      26 |
    > 27 |   if (browserContext.pages().length === 1) await browserContext.waitForEvent('page');