Consolidate flake8 configuration into pyproject.toml

[p-r-a-v-i-n]

Currently we configuration for other tools in pyproject.toml but for flak8 we are maintaining seperate file.
my moving flake8 config in pyproject.toml keeps project configuration centralized in pyproject.toml

Changes:

• moved flake8 settings from setup.cfg to [tool.flake8] in pyproject.toml
• updated pre-commit flake8 hook to include flake8-pyproject
• removed legacy setup.cfg

[p-r-a-v-i-n]

i don't know if we are ok with adding this ( flake8-pyproject ) extra dependency in pre-commit which requires here to load flake8 config from pyproject.toml

[Copilot]

Pull request overview

This PR centralizes the repository’s Flake8 configuration by moving it from setup.cfg into pyproject.toml, aligning Flake8 with the other tool configurations already managed there.

Changes:

• Removed the legacy setup.cfg that only contained Flake8 settings.
• Added a [tool.flake8] section to pyproject.toml with the prior settings.
• Updated the pre-commit Flake8 hook to install flake8-pyproject so Flake8 can read pyproject.toml.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
setup.cfg	Removes legacy Flake8-only config file.
pyproject.toml	Adds centralized [tool.flake8] configuration.
.pre-commit-config.yaml	Ensures pre-commit Flake8 can load config from pyproject.toml via flake8-pyproject.

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