uv

295b58ad - Add `uv-workspace` crate with settings discovery and deserialization (#3007)

Add `uv-workspace` crate with settings discovery and deserialization (#3007) ## Summary This PR adds basic struct definitions along with a "workspace" concept for discovering settings. (The "workspace" terminology is used to match Ruff; I did not invent it.) A few notes: - We discover any `pyproject.toml` or `uv.toml` file in any parent directory of the current working directory. (We could adjust this to look at the directories of the input files.) - We don't actually do anything with the configuration yet; but those PRs are large and I want this to be reviewed in isolation.