feat: Add pagination with total count to generation listings and enable filtering assets by type.

api/models/GenerationRequest.py

@@ -18,6 +18,11 @@ class GenerationRequest(BaseModel):
     assets_list: List[str]
 
 
+class GenerationsResponse(BaseModel):
+    generations: List["GenerationResponse"]
+    total_count: int
+
+
 class GenerationResponse(BaseModel):
     id: str
     status: GenerationStatus