More ergonomic verify API

Signed-off-by: Mihai Maruseac <[email protected]>

model_signing/manifest/manifest.py

@@ -160,8 +160,11 @@ def extract_from_untrusted(file: pathlib.Path) -> Self:
         pass
 
     @abstractmethod
-    def verify(self, objects: list[ManifestItem]) -> bool:
-        """Verifies the integrity of the given objects and any constraints."""
+    def verify(self, only_for_objects: list[ManifestItem]) -> bool:
+        """Verifies the integrity of the given objects and any constraints.
+
+        If the list of objects is empty, validate all hashes for all objects.
+        """
         pass
 
     @abstractmethod