Typing and general code cleanup

b_asic/core_operations.py

b_asic/graph_component.py

b_asic/operation.py

b_asic/resources.py

b_asic/schedule.py

b_asic/sfg_generators.py

b_asic/signal_flow_graph.py

b_asic/simulation.py

b_asic/special_operations.py

test/test_sfg.py