Add Window::set_content_protected on macOS and Windows (#2525)

* Add `Window::set_content_protect` on macOS and Windows

* Update window.rs

* Add builder variant

* fix import

* fix argument type

* fix import

* fix always visible window on Windows

* update docs

src/platform_impl/macos/appkit/window.rs

@@ -84,6 +84,9 @@ extern_methods!(
         #[sel(setMovable:)]
         pub fn setMovable(&self, movable: bool);
 
+        #[sel(setSharingType:)]
+        pub fn setSharingType(&self, sharingType: NSWindowSharingType);
+
         #[sel(setOpaque:)]
         pub fn setOpaque(&self, opaque: bool);
 
@@ -349,3 +352,16 @@ pub enum NSBackingStoreType {
 unsafe impl Encode for NSBackingStoreType {
     const ENCODING: Encoding = NSUInteger::ENCODING;
 }
+
+#[allow(dead_code)]
+#[repr(usize)] // NSUInteger
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum NSWindowSharingType {
+    NSWindowSharingNone = 0,
+    NSWindowSharingReadOnly = 1,
+    NSWindowSharingReadWrite = 2,
+}
+
+unsafe impl Encode for NSWindowSharingType {
+    const ENCODING: Encoding = NSUInteger::ENCODING;
+}