WIP: Switch to poetry

[zStupan]

Summary

• Switched from Pipenv to poetry for dependency management.
• Removed unnecessary config files.
• Updated the main workflow.
• Updated docs
• The minimum required python version is now 3.9.
• Moved tests out of the niapy package.
• Closes Switch to Poetry #403
• Closes Program versions #400

TODO:

• I haven't figured out the publishing to pypi and conda workflows/config yet
• Use ruff for linting and fixing code style errors. The config can be written directly to pyproject.toml.

[firefly-cpp]

Thanks, @zStupan

[firefly-cpp]

LGTM

[firefly-cpp]

@GregaVrbancic, can you try to build it and publish a new release on Pypi?

[zStupan]

I'm not sure about conda, but this is a workflow that should work for PyPI:

name: Build and Publish NiaPy Pypi Package

on:
  release:
    types: [published]

jobs:
  release:
    name: Release
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up Python 3.10
        uses: actions/setup-python@v4
        with:
          python-version: "3.10"

      - name: Install Poetry
        run: |
          curl -sSL https://install.python-poetry.org | python - -y

      - name: Update PATH
        run: echo "$HOME/.local/bin" >> $GITHUB_PATH

      - name: Build project for distribution
        run: poetry build

      - name: Check Version
        id: check-version
        run: |
          [[ "$(poetry version --short)" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || echo prerelease=true >> $GITHUB_OUTPUT

      - name: Publish to PyPI
        env:
          POETRY_PYPI_TOKEN_PYPI: ${{ secrets.PYPI_TOKEN }}
        run: poetry publish

based on: https://github.com/python-poetry/poetry/blob/master/.github/workflows/release.yml