Implement the XTWINOPS (CSI t) control sequences that "make sense".

These sequences were implemented:

CSI 14 t - report the text area size in pixels
CSI 16 t - report the cell size in pixels
CSI 18 t - report the text area size in cells
CSI 21 t - report the window title

These sequences were not implemented because they manuipulate the window
state in ways that we do not want.

CSI 1 t
CSI 2 t
CSI 3 ; x ; y t
CSI 4 ; height ; width ; t
CSI 5 t
CSI 6 t
CSI 7 t
CSI 8 ; height ; width ; t
CSI 9 ; 0 t
CSI 9 ; 1 t
CSI 9 ; 2 t
CSI 9 ; 3 t
CSI 10 ; 0 t
CSI 10 ; 1 t
CSI 10 ; 2 t
CSI 24 t

These sequences were not implemented because they do not make sense in
a Wayland context:

CSI 11 t
CSI 13 t
CSI 14 ; 2 t

These sequences were not implemented because they provide information
about the screen that is unnecessary.

CSI 15 t
CSI 19 t

These sequences were not implemeted because Ghostty does not maintain an
icon title for windows.

CSI 20 t
CSI 22 ; 0 t
CSI 22 ; 1 t
CSI 23 ; 0 t
CSI 23 ; 1 t

These sequences were not implemented because of the additional
complexity of maintaining a stack of window titles.

CSI 22 ; 2 t
CSI 23 ; 2 t

src/termio/message.zig

@@ -42,9 +42,10 @@ pub const Message = union(enum) {
     /// Resize the window.
     resize: Resize,
 
-    /// Request a size report is sent to the pty (in-band size report,
-    /// mode 2048: https://gist.github.com/rockorager/e695fb2924d36b2bcf1fff4a3704bd83)
-    size_report: void,
+    /// Request a size report is sent to the pty ([in-band
+    /// size report, mode 2048](https://gist.github.com/rockorager/e695fb2924d36b2bcf1fff4a3704bd83) and
+    /// [XTWINOPS](https://invisible-island.net/xterm/ctlseqs/ctlseqs.htmli#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps;Ps;Ps-t.1EB0)).
+    size_report: SizeReport,
 
     /// Clear the screen.
     clear_screen: struct {
@@ -94,6 +95,14 @@ pub const Message = union(enum) {
             .alloc => |v| Message{ .write_alloc = v },
         };
     }
+
+    /// The types of size reports that we support
+    pub const SizeReport = enum {
+        mode_2048,
+        csi_14_t,
+        csi_16_t,
+        csi_18_t,
+    };
 };
 
 /// Creates a union that can be used to accommodate data that fit within an array,