Integrate flake8 and pyre for automated linting and type checking

[TaekyungHeo]

Summary

• Enabled flake8 and pyre linting.
• Added automated linting workflow.
• Fixed flake8 and pyre warnings/errors.

Test Plan

Ran flake8 and pyre.

$ flake8 .
$ pyre check

Ran post-processing steps.

$ cd ~/param
$ cd param/train/comms/pt
$ pip install .
$ cd ../../compute/python
$ pip install -r requirements.txt
$ python setup.py install
$ python tools/trace_link.py --pytorch-et-file ~/llama_pytorch_et/llama_et_0.json --kineto-file ~/llama_kineto/worker0_step_12.1697596714999.pt.trace.json --output-file ~/rank0.json

$ cd ~/charka
$ pip install .
$ python3 -m chakra.et_converter.et_converter --input_type PyTorch --input_filename ~/rank0.json --output_filename ~/rank0.chakra --num_dims 1

[github-actions]

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