feat: add subscriber for wayland

[Decodetalkers]

This pr add a new crate to support listen to the addon of output.

and allow new layershell be add to target output

resolve: #82

[Decodetalkers]

Seems the wl_output by other task cannot be used to create new layershell? .. Emm

[id3v1669]

self.xdg_info_cache in not always populated at this point
Following cycle must be either copied here or moved outside of if is_allscreens statement where it is already present:

for (_, output_display) in &self.outputs {
    let zxdgoutput = xdg_output_manager.get_xdg_output(output_display, &qh, ());
    self.xdg_info_cache
        .push((output_display.clone(), ZxdgOutputInfo::new(zxdgoutput)));
}

[Decodetalkers]

self.xdg_info_cache in not always populated at this point Following cycle must be either copied here or moved outside of if is_allscreens statement where it is already present:

for (_, output_display) in &self.outputs {
    let zxdgoutput = xdg_output_manager.get_xdg_output(output_display, &qh, ());
    self.xdg_info_cache
        .push((output_display.clone(), ZxdgOutputInfo::new(zxdgoutput)));
}

It should has be added at
https://github.com/waycrate/exwlshelleventloop/pull/86/files#diff-d794182b4533a00f543694b67814cc1ffca93afbc14c08c438cb67f8994c821eR2141-R2208

Emm , I do not think add this logic is good..

[Decodetalkers]

@MalpenZibo I think maybe this pr is quite late, but Finally I seems find a way to solve it. Can you help take a look? Thanks. Or maybe there are other wayland event that you want, place comment here

[MalpenZibo]

I can check in January! I'll let you know. Anyway I only need a way to get attached monitors