Merge fork/feature/protein-qa: resolve conflicts and remove deprecated graphgen.py

Author: CHERRY-ui8

graphgen/models/generator/__init__.py

@@ -3,5 +3,6 @@
 from .cot_generator import CoTGenerator
 from .multi_hop_generator import MultiHopGenerator
 from .omics_qa_generator import OmicsQAGenerator
+from .protein_qa_generator import ProteinQAGenerator
 from .quiz_generator import QuizGenerator
 from .vqa_generator import VQAGenerator