[Files\read] add support for different delimiters when in `.csv` mode

[github-actions[bot]]

[Files\read] add support for different delimiters when in .csv mode this could be something as simple as .with: or .delimiter:, or .delimited: also see: https://github.com/arturo-lang/arturo/pull/1008#issuecomment-1450571702

https://github.com/arturo-lang/arturo/blob/411617a1906063cf0adfd3ac06804dc4b29403a0/src/library/Files.nim#L241

                    push(VNULL)

        # TODO(Files\read) add support for different delimiters when in `.csv` mode
        #  this could be something as simple as `.with:` or `.delimiter:`, or `.delimited:`
        #  also see: https://github.com/arturo-lang/arturo/pull/1008#issuecomment-1450571702
        #  labels:library,enhancement

        # TODO(Files\read) show a warning in case an unsupported attribute is used in MINI builds
        #  right now, passing e.g. `.html` in a MINI build will silently fail, but
        #  the results might be too confusing: 
        #  https://github.com/arturo-lang/arturo/pull/1008#issuecomment-1451696988

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