Added Playwright test for bruno-testbench, few sanity tests and improvements

- Trace will capture snapshots now
- Added ability to add init Electron user-data, preferences and other
  app settings.
- Improved test Fixtures
  - Use tempdir for Electron user-data
  - Ability to reuse app instance for a given init user-data by placing
    them in a folder(`pageWithUserData` Fixture)
  - Ability to create tests with fresh user-data(`newPage` Fixture)
- Improved logging
- Improved the env vars to customize the Electron user-data-path

contributing.md

@@ -99,14 +99,13 @@ npm run dev
 ```
 
 #### Customize Electron `userData` path
-If `ELECTRON_APP_NAME` env-variable is present and its development mode, then the `appName` and `userData` path is modified accordingly.
+If `ELECTRON_USER_DATA_PATH` env-variable is present and its development mode, then `userData` path is modified accordingly.
 
 e.g.
 ```sh
-ELECTRON_APP_NAME=bruno-dev npm run dev:electron
+ELECTRON_USER_DATA_PATH=$(realpath ~/Desktop/bruno-test) npm run dev:electron
 ```
-
-> This doesn't change the name of the window or the names in lot of other places, only the name used by Electron internally.
+This will create a `bruno-test` folder on your Desktop and use it as the `userData` path.
 
 ### Troubleshooting