Add missing is_open() to ProtoInputStream

[TaekyungHeo]

Summary

is_open() function was missing in ProtoInputStream, and this PR fixes the bug.

Test Plan

$ cd ./astra-sim/
$ docker build -t astra-sim .
$ docker run -it astra-sim
$ cd ./extern/graph_frontend/chakra
$ pip3 install .
$ python3 -m chakra.et_generator.et_generator --num_npus 64 --num_dims 1
$ cd -
$ ./build/astra_analytical/build.sh
$ ./build/astra_analytical/build/bin/AstraSim_Analytical_Congestion_Unaware \
  --workload-configuration=./extern/graph_frontend/chakra/one_comm_coll_node_allreduce \
  --system-configuration=./inputs/system/Switch.json \
  --network-configuration=./inputs/network/analytical/Switch.yml \
  --remote-memory-configuration=./inputs/remote_memory/analytical/no_memory_expansion.json
ring of node 0, id: 0 dimension: local total nodes in ring: 64 index in ring: 0 offset: 1total nodes in ring: 64
ring of node 0, id: 0 dimension: local total nodes in ring: 64 index in ring: 0 offset: 1total nodes in ring: 64
ring of node 0, id: 0 dimension: local total nodes in ring: 64 index in ring: 0 offset: 1total nodes in ring: 64
ring of node 0, id: 0 dimension: local total nodes in ring: 64 index in ring: 0 offset: 1total nodes in ring: 64
sys[0] finished, 39582 cycles
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