i3-sway: Allow providing order of other workspaces

[KoviRobi]

I'm using i3, not sway.

For multi-monitor setups, I end up the second screen having workspace 10 (because it is bound to Mod4+0, so ordered before the other numbers).

Needs more testing, especially with sway/tweaking to get it to work with sway. But posting it here because it might be useful.

CC #6041

Description

Checklist

• Change is backwards compatible -- I tried to make it so by making defaultWorkspace have a priority of 100. But strictly speaking this isn't backwards compatible, because it makes workspace number 1 the default, not number 10. (See tests).

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all
  or nix build --reference-lock-file flake.lock ./tests#test-all using Flakes.

  This currently moves the workspace stuff next to eachother, because I thought it's neater, but it isn't necessary.

  Currently the sway tests are broken, because I haven't fixed sway up

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

Maintainer CC

@sumnerevans