feat(wm): add replace configuration socket message

This commit introduces a new SocketMessage, ReplaceConfiguration, which
attempts to replace a running instance of WindowManager with another
created from a (presumably) different komorebi.json file.

This will likely be useful for people who have multiple different
monitor setups that they connect and disconnect from throughout the day,
but definitely needs more testing.

An experimental sub-widget which calls this SocketMessage has been added
to komorebi-bar to aid with initial testing.

Cargo.lock

@@ -2693,6 +2693,7 @@ dependencies = [
  "color-eyre",
  "crossbeam-channel",
  "dirs",
+ "dunce",
  "eframe",
  "egui-phosphor",
  "font-loader",