ref(event): remove .resize and replace with recursize method calls

This also means that currently the dynamic resizing through the app's
detached thread is not working, as it cannot send size updates. The
examples have been overhauled to still implement intermediate mode
applications accordingly.

src/event.zig

@@ -21,8 +21,6 @@ pub const SystemEvent = union(enum) {
         /// associated error message
         msg: []const u8,
     },
-    /// Size event emitted by the terminal to derive the `Size` of the current terminal the application is rendered in
-    size: Point,
     /// Input key event received from the user
     key: Key,
     /// Mouse input event