first step to get electron browser running, but tests not working yet

[trusktr]

TODO:

• [x] enable launching playwrite._electron experimental Electron launcher.
• [ ] the window pops open, but it appears the tests are hung, maybe the context/page handling needs to be adjusted, the API is slightly different than other browsers and there seems to be only a single context and page, not multiple like other browsers, or maybe I missed it.

[changeset-bot[bot]]

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