Add movecursortomonitor dispatcher

[Insprill]

Describe your PR, what does it fix/add?

Adds the movecursortomonitor dispatcher to move the cursor to a specific monitor.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

I think I did the hyprctl completions correctly, but please double-check.

Is it ready for merging, or does it need work?

Yes

[vaxerski]

...what's the point?

[Insprill]

My main use case is part of a workaround for the split-monitor-workspaces plugin I use. I have the cursor:default_monitor config value set, but when the plugin loads, it moves the default workspace (and cursor) to a different monitor, making that config option useless. With this MR, I used a hyprctl command to set the cursor back to my default display after loading plugins.

Since there are already dispatchers for moving the cursor to an arbitrary position and the corner of a window, as well as for moving workspaces to specific monitors, I thought adding one to move the cursor to a monitor was fitting. If it's unwanted, I'll fix it in the plugin itself (which I'll probably do anyways), but I figured I'd try to upstream something first in case it'd help others, too.