Add mangowc support to dms setup

### Feature Description

Currently, the dms setup command can generate configurations for Niri and Hyprland. I would like to suggest adding support for mangowc as well.

It would be great if users could run dms setup to automatically generate a new compositor configuration for mangowc, similar to how it currently works for Niri and Hyprland.

### Use Case

_No response_

### Compositor(s)

- [ ] All compositors
- [ ] Niri
- [ ] Hyprland
- [x] MangoWC (dwl)
- [ ] Sway
- [ ] Other (specify below)

### Proposed Solution

_No response_

### Alternatives/Existing Solutions

_No response_

Start at the dms setup command and compare how the existing Niri and Hyprland configuration generation is exposed. Review MangoWC configuration requirements, then verify that dms setup can generate a usable MangoWC compositor configuration alongside those existing options.

Written by the indexing model from the issue text.