Enable instant only for wasm32 targets

... and hide the dependency under a `time` module in `iced_native`

native/src/debug/basic.rs

@@ -1,5 +1,7 @@
 #![allow(missing_docs)]
-use std::{collections::VecDeque, time};
+use crate::time;
+
+use std::collections::VecDeque;
 
 /// A bunch of time measurements for debugging purposes.
 #[derive(Debug)]

native/src/lib.rs

@@ -49,6 +49,7 @@ pub mod renderer;
 pub mod subscription;
 pub mod svg;
 pub mod text;
+pub mod time;
 pub mod touch;
 pub mod user_interface;
 pub mod widget;

native/src/mouse/click.rs

@@ -1,6 +1,6 @@
 //! Track mouse clicks.
+use crate::time::Instant;
 use crate::Point;
-use instant::Instant;
 
 /// A mouse click.
 #[derive(Debug, Clone, Copy)]

native/src/time.rs

@@ -0,0 +1,7 @@
+//! Keep track of time, both in native and web platforms!
+
+#[cfg(target_arch = "wasm32")]
+pub use instant::{Duration, Instant};
+
+#[cfg(not(target_arch = "wasm32"))]
+pub use std::time::{Duration, Instant};