Web: monitor API improvements (#3847)

- Improved the documentation to point users into the right direction from all kinds of methods and types.
- De-duplicated some code and added more comments.
- Implement an ID system to correctly and efficiently implement `Eq`, `Hash`, `Ord`, `PartialEq` and `PartialOrd`.
- Fixed screen locking support being cached thread local, ergo calling from a different thread would require to make the check again, not fulfilling its purpose as a fast-path at all.

src/platform_impl/web/event_loop/window_target.rs

@@ -652,7 +652,7 @@ impl ActiveEventLoop {
     }
 
     pub(crate) fn request_detailed_monitor_permission(&self) -> MonitorPermissionFuture {
-        self.runner.monitor().request_detailed_monitor_permission(self.runner.weak())
+        self.runner.monitor().request_detailed_monitor_permission()
     }
 
     pub(crate) fn has_detailed_monitor_permission(&self) -> bool {