scripts: added inline script metadata per PEP 723

[isaac-mcfadyen]

Motivation

In October 2023, PEP 723 introduced an official specification for inline script metadata: https://packaging.python.org/en/latest/specifications/inline-script-metadata/

Inline script metadata allows compatible tools to discover the dependencies of a given script without needing to parse any requirements.txt or pyproject.toml.

For example, the uv tool supports this, which means you can just run uv run ./script.py and it will automatically parse the metadata and create a temporary virtual environment.

Because inline metadata is just a comment, it's fully backwards-compatible; tools that don't use it will just ignore it.

Changes

This PR adds inline metadata to the Python scripts in the scripts/ directory, such that they can be directly run with compatible tools.

Example (note that I wasn't in a virtual environment and my global Python packages remained untouched):

❯ uv run ./scripts/get_chat_template.py CohereForAI/c4ai-command-r7b-12-2024 tool_use
Reading inline script metadata from `scripts/get_chat_template.py`
Installed 12 packages in 8ms
# ... output of script as normal ...