Add autorelease workflow

Nobody has claimed this yet.

To simplify the release workflow we could create a GitHub action that automatically bumps the version and releases the package to PyPI. An example script could look like this:
```yaml
name: Deploy to PyPI

on:
workflow_dispatch:
inputs:
version-type:
description: 'Version bump type (major, minor, patch)'
required: true
default: 'patch'

jobs:
deploy:
runs-on: ubuntu-latest
steps:
- name: Check out repository
uses: actions/checkout@v2

- name: Set up Python
uses: actions/setup-python@v2
with:
python-version: '3.7'

- name: Install Poetry
run: |
curl -sSL https://install.python-poetry.org | python3 -
echo "$HOME/.local/bin" >> $GITHUB_PATH

- name: Bump version
run: poetry version ${{ github.event.inputs.version-type }}

- name: Push changes
run: |
git config --local user.email "action@github.com"
git config --local user.name "GitHub Action"
git commit -am "Increase version [skip ci]"
git push

- name: Publish to PyPI
run: poetry publish --build --username __token__ --password ${{ secrets.PYPI_API_TOKEN }}

```

Note: With branch protection enabled we would need to find a way to enable the action committing directly to `main`. I think there's the option to exclude GitHub actions from branch protection rules or we could use a PAT.

Start by reviewing the repository's current versioning and release configuration, then compare it with the proposed GitHub Actions workflow. The workflow should support a selectable major, minor, or patch bump, publish the package to PyPI, and handle the noted branch-protection and authentication requirements.

Written by the indexing model from the issue text.