Indicate when cache is used via info logger

(DIS-2985)

dissect/target/helpers/cache.py

@@ -147,6 +147,7 @@ def call(self, *args, **kwargs):
             if os.access(cache_file, os.R_OK, effective_ids=bool(os.supports_effective_ids)):
                 if os.stat(cache_file).st_size != 0:
                     try:
+                        target.log.info("Using cache for function: %s", self.fname)
                         return self.open_reader(cache_file, output)
                     except Exception as e:
                         target.log.warning("Cache will NOT be used. Error opening cache file: %s", cache_file)