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/csv_knowledge_source.py

@@ -10,19 +10,15 @@ class CSVKnowledgeSource(BaseFileKnowledgeSource):
 
     def load_content(self) -> Dict[Path, str]:
         """Load and preprocess CSV file content."""
-        super().load_content()  # Validate the file path
-
-        file_path = (
-            self.file_path[0] if isinstance(self.file_path, list) else self.file_path
-        )
-        file_path = Path(file_path) if isinstance(file_path, str) else file_path
-
-        with open(file_path, "r", encoding="utf-8") as csvfile:
-            reader = csv.reader(csvfile)
-            content = ""
-            for row in reader:
-                content += " ".join(row) + "\n"
-        return {file_path: content}
+        content_dict = {}
+        for file_path in self.safe_file_paths:
+            with open(file_path, "r", encoding="utf-8") as csvfile:
+                reader = csv.reader(csvfile)
+                content = ""
+                for row in reader:
+                    content += " ".join(row) + "\n"
+                content_dict[file_path] = content
+        return content_dict
 
     def add(self) -> None:
         """