Move flake8 config to pyproject.toml and remove setup.cfg (#9957)

Author: p-r-a-v-i-n

.pre-commit-config.yaml

@@ -17,6 +17,7 @@ repos:
   hooks:
   - id: flake8
     additional_dependencies:
+    - flake8-pyproject
     - flake8-tidy-imports
     - flake8-bugbear
 - repo: https://github.com/adamchainz/blacken-docs

pyproject.toml

@@ -98,6 +98,11 @@ extra_standard_library = [ "types" ]
 known_third_party = [ "pytest", "_pytest", "django", "uritemplate" ]
 known_first_party = [ "rest_framework", "tests" ]
 
+[tool.flake8]
+extend-ignore = [ "E501", "W503", "W504", "B" ]
+extend-select = [ "B006" ]
+banned-modules = "json = use from rest_framework.utils import json!"
+
 [tool.codespell]
 # Ref: https://github.com/codespell-project/codespell#using-a-config-file
 skip = "*/kickstarter-announcement.md,*.js,*.map,*.po,*.css,locale"