windows: mouse and keyboard (#8791)

Windows mouse and keyboard working! I also tweaked the message loop so
that it didn't get stuck. The peek message loop was almost never
returning for me during testing.

Release Notes:

- Added windows mouse and keyboard support

![windows-mouse-and-keyboard](https://github.com/zed-industries/zed/assets/1284289/08578fbf-0cb2-4e44-bab1-3c4f0291ea4b)

crates/gpui/src/platform/windows/util.rs

@@ -3,6 +3,8 @@ use windows::Win32::Foundation::{LPARAM, WPARAM};
 pub(crate) trait HiLoWord {
     fn hiword(&self) -> u16;
     fn loword(&self) -> u16;
+    fn signed_hiword(&self) -> i16;
+    fn signed_loword(&self) -> i16;
 }
 
 impl HiLoWord for WPARAM {
@@ -13,6 +15,14 @@ impl HiLoWord for WPARAM {
     fn loword(&self) -> u16 {
         (self.0 & 0xFFFF) as u16
     }
+
+    fn signed_hiword(&self) -> i16 {
+        ((self.0 >> 16) & 0xFFFF) as i16
+    }
+
+    fn signed_loword(&self) -> i16 {
+        (self.0 & 0xFFFF) as i16
+    }
 }
 
 impl HiLoWord for LPARAM {
@@ -23,4 +33,12 @@ impl HiLoWord for LPARAM {
     fn loword(&self) -> u16 {
         (self.0 & 0xFFFF) as u16
     }
+
+    fn signed_hiword(&self) -> i16 {
+        ((self.0 >> 16) & 0xFFFF) as i16
+    }
+
+    fn signed_loword(&self) -> i16 {
+        (self.0 & 0xFFFF) as i16
+    }
 }