Consolidate configurations into pyproject.toml

[candleindark]

This PR closes #324. It move all configurations from setup.cfg to pyproject.toml and some configurations in tox.ini to pyproject.toml. The only configurations that remain in tox.ini are the ones for tox and flake8. The configurations for flake8 are not supported to be expressed in pyproject.toml. As for the configurations for tox, they seems to be more intuitive to stay in tox.ini, moving them over to pyproject.toml will significantly enlarge it.

Additionally, this PR also includes the following adjustments.

1. update of the project description in pyproject.toml.
2. keys in [project.urls] in pyproject.toml have been adjusted to well-known labels.
3. license classifier has been removed as it is deprecated

TODO:

• Test build locally

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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[Copilot]

Pull request overview

This PR consolidates build and tool configurations by migrating settings from setup.cfg and tox.ini into pyproject.toml, following modern Python packaging standards. The migration eliminates setup.cfg entirely while retaining only tox and flake8 configurations in tox.ini (since flake8 doesn't support pyproject.toml).

Changes:

• Migrated all project metadata, dependencies, and entry points from setup.cfg to pyproject.toml
• Moved tool configurations (pytest, mypy, isort, coverage) from tox.ini to pyproject.toml
• Updated project description and adjusted project URL keys

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
pyproject.toml	Added complete project metadata, optional dependencies, scripts, and tool configurations (pytest, mypy, isort, coverage, setuptools)
setup.cfg	Removed entirely - all configurations migrated to pyproject.toml
tox.ini	Removed migrated configurations (pytest, coverage, isort) while keeping tox and flake8 configs

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[yarikoptic]

@asmacdo please re-review

[asmacdo]

LGTM thanks @candleindark!