Base Chromium support

[mdmintz]

Base Chromium support

This is for the base "Chromium" browser (not Google Chrome).
https://storage.googleapis.com/chromium-browser-snapshots/

https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html

https://chromiumdash.appspot.com/schedule

Base Chromium has fewer limitations than regular Chrome.
(Eg. It can still load extensions from the command-line after Chromium 142.)

Using --use-chromium / use_chromium=True will now force the usage of base Chromium.
If it's not already in SeleniumBase/drivers/chromium_drivers/, then the browser (and the driver) will be downloaded there.

The "sbase get chromium" shortcut will download the latest Chromium to SeleniumBase/drivers/chromium_drivers/.

This should fully resolve #4053 with the Chromium workaround.

[mdmintz]

This was resolved in 4.45.3 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.45.3