Knowledge project directory standard (#1691)

* Knowledge project directory standard

* fixed types

* comment fix

* made base file knowledge source an abstract class

* cleaner validator on model_post_init

* fix type checker

* cleaner refactor

* better template

src/crewai/knowledge/source/json_knowledge_source.py

@@ -10,11 +10,9 @@ class JSONKnowledgeSource(BaseFileKnowledgeSource):
 
     def load_content(self) -> Dict[Path, str]:
         """Load and preprocess JSON file content."""
-        super().load_content()  # Validate the file path
-        paths = [self.file_path] if isinstance(self.file_path, Path) else self.file_path
-
         content: Dict[Path, str] = {}
-        for path in paths:
+        for path in self.safe_file_paths:
+            path = self.convert_to_path(path)
             with open(path, "r", encoding="utf-8") as json_file:
                 data = json.load(json_file)
             content[path] = self._json_to_text(data)