Migrate from Poetry to uv for package management

[colesmcintosh]

Summary

• Replace Poetry with uv for faster, more modern Python package management
• Convert pyproject.toml to PEP 621 format with hatchling build backend
• Update CI workflows to use the official astral-sh/setup-uv action
• Update Makefile commands to use uv run instead of poetry run

Changes

• pyproject.toml: Converted to PEP 621 format, using [dependency-groups] for dev dependencies
• CI workflows: Replaced snok/install-poetry with astral-sh/setup-uv@v4
• Makefile: All poetry run commands changed to uv run
• README.md: Updated development instructions
• Added .python-version file (3.11)
• Replaced poetry.lock with uv.lock

[github-actions]

👋 Welcome to langchain-salesforce!

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📚 Documentation

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