Add option to sort workspaces by their position when using -a

[orestisfl]

Using --sort-by <method> here could be a bit weird since the other boolean arguments (-a, -c, -i, -w) are not parsed with strings. What do you think?

We could also add a flag to prioritize the 'primary' output.

[cornerman]

Looks good! If it was just for me, I would be fine with just location-based sorting, but if there is a use-case for a number-based sorting we can add it.

With the boolean options, we do not have much choice here. I quite like the sort-by option. An alternative would be to have: all, all-by-num, all-by-location. But this might be confusing.

[orestisfl]

Thanks for the corrections, up

[cornerman]

Then this is ready for merging! Thanks for all the contributions :)