Properly implement Debug for Window and EventLoop types (#3297)

For EventLoop, EventLoopBuilder, EventLoopProxy and by requiring it as
a supertrait of Window and ActiveEventLoop.

It is especially useful for user to be able to know that Window is Debug.

src/platform_impl/orbital/mod.rs

@@ -15,6 +15,7 @@ pub(crate) use crate::cursor::{
 };
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 
+#[derive(Debug)]
 struct RedoxSocket {
     fd: usize,
 }
@@ -67,6 +68,7 @@ impl Drop for RedoxSocket {
     }
 }
 
+#[derive(Debug)]
 pub struct TimeSocket(RedoxSocket);
 
 impl TimeSocket {