Add GitHub Action to publish Python package to PyPI on release

[devin-ai-integration]

Add GitHub Action for PyPI Publishing

This PR adds a GitHub Action workflow that automatically publishes the liquidai-cli Python package to PyPI when a new release is created.

Changes:

• Add workflow file that triggers on release creation
• Set up testing with Python 3.10, 3.11, and 3.12
• Configure build and publish steps using PyPI credentials

Required Secrets:

Before this can work in production, the following secrets need to be added to the repository:

• PYPI_USERNAME: PyPI username (or __token__ if using API token)
• PYPI_API_TOKEN: PyPI API token for authentication

Link to Devin run: https://app.devin.ai/sessions/091656c5a70248bd94734475445a4b72
User: liren@liquid.ai

[devin-ai-integration]

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