Add ability to pass a list to `chromium_arg`, (not just a comma-separated string)

[mdmintz]

Add ability to pass a list to chromium_arg, (not just a comma-separated string).

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Currently, a comma-separated string must be passed in to chromium_arg:

• chromium_arg="ARG1=N,ARG2"

I'll add the ability for chromium_arg to accept a list as input too:

• chromium_arg=["ARG1=N", "ARG2"]

[mdmintz]

This was resolved in 4.31.0 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.31.0