Reinstate devtools debug logging with opt-out

Reinstate `web` logging when devtools is in use, making use of the new
logging groups support. Devtools now also logs an `INFO` message
informing that properties defaults are offers an easy way to disable
them.

Closes gh-14450

spring-boot-project/spring-boot-devtools/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -19,6 +19,12 @@
         "reason": "Remote debug is no longer supported.",
         "level": "error"
       }
+    },
+    {
+      "name": "spring.devtools.add-properties",
+      "type": "java.lang.Boolean",
+      "description": "Whether to enable devtool property defaults.",
+      "defaultValue": true
     }
   ]
-}
+}