[OTHER] Fix annotation problems

[mehmetozsoy-synnada]

Summary

Fix missing type annotations in Mithril in specified folders

Context

Fix missing type annotations in following folders / files:

• framework
  • logical
    • base.py
    • essential_primitives.py
    • model.py
    • primitive.py
  • physical
    • data_store.py
    • flat_graph.py
    • model.py
  • common.py
  • constraints.py
  • utils.py