core: add new OSC parser

This replaces the OSC parser with one that only uses a state machine to
determine which OSC is being handled, rather than parsing the whole OSC.
Once the OSC command is determined the remainder of the data is stored
in a buffer until the terminator is found. The data is then parsed to
determine the final OSC command.

src/terminal/kitty/color.zig

@@ -17,6 +17,10 @@ pub const OSC = struct {
     /// request.
     terminator: Terminator = .st,
 
+    pub fn deinit(self: *OSC, alloc: std.mem.Allocator) void {
+        self.list.deinit(alloc);
+    }
+
     /// We don't currently support encoding this to C in any way.
     pub const C = void;