aerospace: add extraConfig

[leon-erd]

Description

I added an "extraConfig" option to aerospace. This allows to write a multiline string directly to the toml file. This is needed for aerospace because for certain commands you need multiline strings in your toml.
E.g. suggested in the default config (https://nikitabobko.github.io/AeroSpace/guide.html#default-config):

alt-enter = '''exec-and-forget osascript -e '
tell application "Terminal"
    do script
    activate
end tell'
'''

Checklist

• Change is backwards compatible.

• Code formatted with nix fmt or
  nix-shell -p treefmt nixfmt deadnix keep-sorted --run treefmt.

• Code tested through nix run .#tests -- test-all or
  nix-shell --pure tests -A run.all.

• Test cases updated/added. See example.

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  {component}: {description}
  
  {long description}
  

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• If this PR adds a new module

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CC Maintainers: @damidoug

[damidoug]

Good point, can be useful... i recommend also you add some testes on
tests/modules/programs/aerospace

[leon-erd]

What do you want tested? :)
Imo there isnt really much to test with this PR it just concats the string provided by the user to the end of the generated toml.
I guess its mostly error prone due to a wrong string provided by the user.

[leon-erd]

By the way on-window-detected is also broken due to the way the toml generator handles arrays of tables.
E.g. this nix expression with the example given in the module

programs.aerospace = {
    enable = true;
    userSettings = {
      on-window-detected = [
        {
          check-further-callbacks = false;
          "if" = {
            app-id = "Another.Cool.App";
            app-name-regex-substring = "CoolApp";
            during-aerospace-startup = false;
            window-title-regex-substring = "Title";
            workspace = "cool-workspace";
          };
          run = [
            "move-node-to-workspace m"
            "resize-node"
          ];
        }
        {
          "if" = {
            app-id = "org.nixos.firefox";
          };
          run = "layout floating";
        }
      ];
    };
  };

creates this toml

~ ➜ cat .config/aerospace/aerospace.toml
accordion-padding = 30
after-startup-command = []
default-root-container-layout = "tiles"
default-root-container-orientation = "auto"
enable-normalization-flatten-containers = true
enable-normalization-opposite-orientation-for-nested-containers = true
exec-on-workspace-change = []
on-focus-changed = []
on-focused-monitor-changed = ["move-mouse monitor-lazy-center"]

[key-mapping]
preset = "qwerty"

[[on-window-detected]]
check-further-callbacks = false
run = ["move-node-to-workspace m", "resize-node"]

[on-window-detected.if]
app-id = "Another.Cool.App"
app-name-regex-substring = "CoolApp"
during-aerospace-startup = false
window-title-regex-substring = "Title"
workspace = "cool-workspace"

[[on-window-detected]]
run = "layout floating"

[on-window-detected.if]
app-id = "org.nixos.firefox"

instead of

[[on-window-detected]]
if.app-id = "org.nixos.firefox"
run = "layout floating"

With this PR the user can at least insert the correct expression directly into the toml