Automate Python package build and publishing process

[d33bs]

This issue describes a multipart effort to automate manubot-ai-editor's Python package build and deployment process. The goal is to integrate this process automatically (where possible) alongside other development tasks which take place. Generally, this workflow could look like:

flowchart LR

pull-request --> |inferred <br> semver for| draft-release
draft-release --> |maintainer <br> decides to| publish-release["publish-release (GH)"]
publish-release --> |references same <br> release for| publish-pypi["publish-release (PyPI)"]

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The following are steps we could take to address this process:

• Move to Poetry package management
• Enable Poetry dynamic versioning
• Add Release Drafter capabilities (focuses on GitHub releases)
• Add Python trusted publisher workflow job (focuses on PyPI releases)