refactor(wm): ensure configurability via ipc

This commit ensures that new features such as stackbar, particularly
where the configuration is located in the global state, can be
configured via SocketMessages.

A few structs had to be moved to komorebi-core to make this possible.
I've also cleaned up a bunch of strum snake_case attrs which seemed to
be unused.

A new GlobalState SocketMessage has been introduced, and going forward
we should make sure that this can send all global state to a requester,
and move global state out of the State handler, which should only handle
window manager state.

komorebi-core/src/arrangement.rs

@@ -321,7 +321,6 @@ impl Arrangement for CustomLayout {
 #[derive(
     Clone, Copy, Debug, Serialize, Deserialize, Display, EnumString, ValueEnum, JsonSchema,
 )]
-#[strum(serialize_all = "snake_case")]
 pub enum Axis {
     Horizontal,
     Vertical,