Add Spotify URI resource helpers

src/spotify.rs

@@ -576,4 +576,20 @@ impl Spotify {
         let new = (progress.as_secs() * 1000) as i32 + progress.subsec_millis() as i32 + delta;
         self.seek(std::cmp::max(0, new) as u32);
     }
+
+    pub fn is_album(s: &str) -> bool {
+        s.starts_with("spotify:album:")
+    }
+
+    pub fn is_artist(s: &str) -> bool {
+        s.starts_with("spotify:artist:")
+    }
+
+    pub fn is_track(s: &str) -> bool {
+        s.starts_with("spotify:track:")
+    }
+
+    pub fn is_playlist(s: &str) -> bool {
+        s.starts_with("spotify:user:") && s.contains(":playlist:")
+    }
 }