core: derive Default for NoCollector (#1785)

* core: derive `Default` for `NoCollector`
* additional clippy nonsense

Signed-off-by: Eliza Weisman <[email protected]>

Author: hawkw

tracing-core/src/collect.rs

@@ -552,7 +552,7 @@ impl Interest {
 ///
 /// [`NoCollector`] implements the [`Collect`] trait by never being enabled,
 /// never being interested in any callsite, and drops all spans and events.
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Default, Copy, Clone)]
 pub struct NoCollector(());
 
 impl Default for NoCollector {