feat: Refactor BugLocalizationRequest model to use Pydantic Fields with descriptions and optional types

utils/model.py

@@ -1,8 +1,17 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from typing import Optional
 
 # TODO: Add Field and descriptions
 class BugLocalizationRequest(BaseModel):
-    issue_key : str
-    summary: str
-    description: str
+    issue_key: Optional[str] = Field(
+        default="", 
+        description="The unique identifier for the issue or bug ticket (e.g., JIRA key). "
+    )
+    summary: Optional[str] = Field(
+        default=None, 
+        description="The short title or summary of the bug."
+    )
+    description: str = Field(
+        ..., 
+        description="A detailed description of the bug."
+    )