added flake.nix (devShell and dep provider) and pyproject.toml (for uv support)

[connerohnesorge]

This pull request introduces initial project configuration for the sam-3d-body repository, focusing on development environment setup and Python project metadata. The most significant changes include the addition of a flake.nix file for Nix-based reproducible development environments and a pyproject.toml file specifying Python dependencies and project details.

Development environment setup:

• Added a new flake.nix file to provide a Nix flake for reproducible development environments, including shell hooks, environment variables, and essential package lists for Linux systems.
• Defined custom shell scripts (e.g., dx for editing flake.nix) and included them in the Nix shell.

Python project configuration:

• Added a pyproject.toml file specifying the project's metadata, Python version requirements, and a comprehensive list of dependencies for machine learning, computer vision, and development tools.
• Configured external package sources for moge and detectron2 using their respective Git repositories, and set up a custom PyTorch CUDA index for binary resolution.

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