Add Mia endpoint connecting to Claude.ai

[salmenus]

Related to #1

Introduces the new mia endpoint to the PyNlux project, connecting to Claude.ai with a smart detective persona named Mia, designed to help users solve complex issues with intelligence and dark humor.

• Endpoint Integration: Adds the /mia route in app/server.py, integrating the mia_chain from the newly created mia package.
• Package Creation: Establishes the packages/mia directory, including the initialization of the Python package, implementation of the mia chain logic in chain.py, and addition of a pyproject.toml file specifying dependencies and package information.
• Documentation and Licensing: Updates the README.md in the root directory to include information about the mia endpoint and adds a README.md in the packages/mia directory for detailed endpoint description. Also, includes an MIT License in the mia package.
• Testing Infrastructure: Sets up a basic testing infrastructure with the addition of a tests/__init__.py file in the mia package.
• Configuration Updates: Modifies the einbot/pyproject.toml to include the mia_chain in the tool.langserve.export_attr, ensuring the mia chain is correctly exported and integrated.

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For more details, open the Copilot Workspace session.