Add more puffin profile scopes to eframe (#3330)

* Add puffin profile scopes to the startup and running of eframe

* puffin_profiler example: start puffin right away

* cargo format let-else statements

* More profile scopes

* Add some `#[inline]`

* Standardize puffin profile scope definitions

* standardize again

* Silence warning when puffin is disabled

crates/egui_extras/src/loaders/image_loader.rs

@@ -20,7 +20,7 @@ impl ImageCrateLoader {
 fn is_supported_uri(uri: &str) -> bool {
     let Some(ext) = Path::new(uri).extension().and_then(|ext| ext.to_str()) else {
         // `true` because if there's no extension, assume that we support it
-        return true
+        return true;
     };
 
     ext != "svg"