Add Brave Search retriever and update application files

application/retriever/duckduck_search.py

@@ -1,5 +1,3 @@
-import json
-import ast
 from application.retriever.base import BaseRetriever
 from application.core.settings import settings
 from application.llm.llm_creator import LLMCreator
@@ -33,7 +31,6 @@ class DuckDuckSearch(BaseRetriever):
             elif inside_brackets:
                 current_item += char
         
-        # Check if there is an unmatched opening bracket at the end
         if inside_brackets:
             result.append(current_item)