migrated setup.py into pyproject.toml #251

[whisk]

This should fix #251

Steps I made to migrate setup.py into the existing pyproject.toml:

1. setuptools-py2cfg setup.py > tmp.cfg
2. ini2toml tmp.cfg > tmp.toml
3. prepend tmp.toml into the existing pyproject.toml
4. pyprojectsort pyproject.toml
5. validate-pyproject pyproject.toml (of course we expect "valid file" verdict here)

old setup.py left as is.

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[what-the-diff]

PR Summary

• Upgrade of build-system configuration
  The build system configuration in the pyproject.toml file was enhanced with deeper level structure, notably new build-backend and requires fields.

• Updates to project metadata
  Updated the project metadata including details about the project's authors, what dependencies it has, its description, name, the version of Python it requires, and its own version.

• Project License Addition
  Added a license to the project to clarify its legal protections and use cases.

• Inclusion of Optional-Dependencies
  Added a new section that describes optional dependencies for the project, specifically for testing.

• Addition of Project Readme
  Introduced a Readme section in the pyproject.toml file specifying the content type and text.

• Optimization of Code Organization Tool (isort)
  Adjusted tooling for code organization (isort) for better handling of import sequences and line length.

• Updates to setuptools
  Improved setuptools configurations to include package data and enhance compatibility with zipped (*.zip) distributions.

• Modifications to setuptools' package finding
  Enhancements made to the way setuptools finds packages by introducing certain exclusions and considerations for namespaces.

• Updates to Code Linter (flake8)
  Adjusted the maximum line length setting for code linter flake8 to improve code readability and maintainability.

• Extensions to File Ignores
  The configuration for excluded files during linting and type checking was modified to include setup.py and tests/oldunit_test.py.

• Removal of Unused Tools
  Removed unnecessary configurations for unused tools, reducing clutter and potential confusion.

• Improvements to Static Type Checker (Pyright)
  Adjusted configurations for static type checker pyright to better manage the files it should include and exclude during its checks. This enhances the efficiency and precision of checks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b3916ee) 93.19% compared to head (c46f066) 93.19%.
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #252   +/-   ##
========================================
  Coverage    93.19%   93.19%           
========================================
  Files           33       33           
  Lines         4794     4794           
========================================
  Hits          4468     4468           
  Misses         326      326           

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