core: add Value impl for Box<T> where T: Value (tokio-rs#2071)

This commit adds a `Value` implementation for `Box<T> where T: Value`.
This is *primarily* intended to make `Box<dyn Error + ...>` implement
`Value`, building on the `Value` impls for `dyn Error + ...` added in
tokio-rs#2066, but it may be useful for other boxed values as well.

Refs: tokio-rs#1308

tracing-core/src/field.rs

@@ -1299,4 +1299,24 @@ mod test {
         });
         assert_eq!(result, format!("{}", r#"[61 62 63]" "[c0 ff ee]"#));
     }
+
+    #[test]
+    #[cfg(feature = "std")]
+    fn record_error() {
+        let fields = TEST_META_1.fields();
+        let err: Box<dyn std::error::Error + Send + Sync + 'static> =
+            std::io::Error::new(std::io::ErrorKind::Other, "lol").into();
+        let values = &[
+            (&fields.field("foo").unwrap(), Some(&err as &dyn Value)),
+            (&fields.field("bar").unwrap(), Some(&Empty as &dyn Value)),
+            (&fields.field("baz").unwrap(), Some(&Empty as &dyn Value)),
+        ];
+        let valueset = fields.value_set(values);
+        let mut result = String::new();
+        valueset.record(&mut |_: &Field, value: &dyn fmt::Debug| {
+            use core::fmt::Write;
+            write!(&mut result, "{:?}", value).unwrap();
+        });
+        assert_eq!(result, format!("{}", err));
+    }
 }