Prevent allocations caused by Logger::log_trace

C++ would always construct an `std::string` from the string constant
every iteration. Since this also happened when `YABRIDGE_DEBUG_LEVEL` is
not set to 2, this ended up causing unnecessary allocations.

src/common/logging/vst3.h

@@ -35,13 +35,6 @@ class Vst3Logger {
      */
     inline void log(const std::string& message) { logger.log(message); }
 
-    /**
-     * @see Logger::log_trace
-     */
-    inline void log_trace(const std::string& message) {
-        logger.log_trace(message);
-    }
-
     /**
      * Log calls to `FUnknown::queryInterface`. This will separately log about
      * successful queries, queries for interfaces the object did not implement,
@@ -340,6 +333,14 @@ class Vst3Logger {
         });
     }
 
+    /**
+     * @see Logger::log_trace
+     */
+    template <invocable_returning<std::string> F>
+    inline void log_trace(F&& fn) {
+        logger.log_trace(std::forward<F>(fn));
+    }
+
     Logger& logger;
 
    private: