Add lint config

Author: Luan Pham

.flake8

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+[flake8]
+max-line-length = 88
+ignore = E203, E231, E266, E501, W503, F403, F405
+max-complexity = 25
+select = B,C,E,F,W,T4,B9

.isort.cfg

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+[settings]
+line_length=88
+multi_line_output=3
+include_trailing_comma=True
+skip=scripts/**

.pre-commit-config.yaml

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+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v2.3.0
+  hooks:
+  - id: check-yaml
+  - id: end-of-file-fixer
+  - id: trailing-whitespace
+  - id: detect-aws-credentials
+  - id: detect-private-key
+  - id: end-of-file-fixer
+  - id: check-added-large-files
+- repo: https://github.com/ambv/black
+  rev: 21.5b0
+  hooks:
+  - id: black
+    language_version: python3.9
+- repo: https://github.com/pycqa/isort
+  rev: 5.8.0
+  hooks:
+  - id: isort
+    args: [--profile, black]
+- repo: https://gitlab.com/pycqa/flake8
+  rev: 3.9.1
+  hooks:
+  - id: flake8
+- repo: https://github.com/myint/autoflake
+  rev: v1.4
+  hooks:
+  - id: autoflake
+    args: [
+      "--in-place",
+      "--remove-unused-variables",
+      "--remove-all-unused-imports",
+      "--exclude=tests/*",
+    ]