Add progress bar for loading graphs.

[siyuan0322]

Fixes the graph loading part in #756

[siyuan0322]

>>> graph = load_modern_graph(sess, f"{test_repo_dir}/modern_graph")

I1014 19:15:18.000000 677066 /root/GraphScope/analytical_engine/core/grape_instance.cc:895] Registering Graph, graph type: ARROW_PROPERTY, Type sigature: e33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521, lib path: /tmp/gs/builtin/e33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521/libe33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521.so
I1014 19:15:18.000000 677064 /root/GraphScope/analytical_engine/core/grape_instance.cc:895] Registering Graph, graph type: ARROW_PROPERTY, Type sigature: e33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521, lib path: /tmp/gs/builtin/e33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521/libe33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521.so
I1014 19:15:18.000000 677066 /root/GraphScope/analytical_engine/core/grape_instance.cc:111] Loading graph, graph name: graph_a37JncCH, graph type: ArrowFragment, type sig: e33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521
I1014 19:15:18.000000 677064 /root/GraphScope/analytical_engine/core/grape_instance.cc:111] Loading graph, graph name: graph_a37JncCH, graph type: ArrowFragment, type sig: e33529e80839a2064a804ce453c761a9483aa7ab775bcfddc1a1f9da63dcb521
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Loading: 100%|██████████| 10/10 [00:00<00:00, 102.95it/s]

Loading: 100%|██████████| 10/10 [00:00<00:00, 118.55it/s]

Loading: 100%|██████████| 10/10 [00:00<00:00, 120.46it/s]

[yecol]

progress bar wording: Loading -> Loading graph.