Update pyproject toml

[kwabenantim]

Description

Fixes #381

Motivation and Context

Modernises setup.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Documentation checklist

• I have updated all documentation in the code where necessary.
• I have checked spelling in all (new) comments and documentation.
• I have added a note to RELEASE.md if relevant (new feature, breaking change, or notable bug fix).

Testing

• Testing is done automatically and codecov shows test coverage
• This cannot be tested automatically

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (bbc77ec) to head (e747ac5).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #382   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines         1594      1594           
  Branches       327       327           
=========================================
  Hits          1594      1594           

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[Copilot]

Pull request overview

This PR completes the migration of packaging and tooling configuration to pyproject.toml (per #381), removing legacy setup.py/setup.cfg and aligning CI with the new layout.

Changes:

• Migrates project metadata, dependencies, and package discovery into pyproject.toml (PEP 621 + setuptools config).
• Moves tool configuration: isort into pyproject.toml and flake8 into a dedicated .flake8 file.
• Updates GitHub Actions to stop referencing the removed setup.py, and bumps Codecov action to codecov/codecov-action@v7.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
setup.py	Removed legacy setuptools configuration in favor of pyproject.toml.
setup.cfg	Removed legacy flake8/isort config (migrated elsewhere).
pyproject.toml	Adds full project metadata, dependencies, dynamic version, and isort configuration.
.github/workflows/style.yml	Updates isort invocation to exclude the removed setup.py.
.github/workflows/coverage.yml	Updates Codecov Action version to v7.
.flake8	Adds flake8 configuration previously stored in setup.cfg.

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