Add common traits for many (but not all) structs

[alexespencer]

No description provided.

[Copilot]

Pull Request Overview

This PR extends several core structs with common trait derives, refactors the Point type to use OrderedFloat for total ordering, and adapts related code for those changes.

• Derive Clone, Debug, and PartialEq on DistanceQuery, QuadTree, and other types.
• Refactor Point to wrap its coordinates in OrderedFloat, add Display, Default, and manual (de)serialization support.
• Update Region::contains and other call sites to work with the new Point::dimension_values API.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
quadtree/src/region.rs	Updated contains to pass a reference to values now returned by array.
quadtree/src/query.rs	Added #[derive(Clone, Debug)] to DistanceQuery.
quadtree/src/quadtree.rs	Added #[derive(Clone, PartialEq, Debug)] to QuadTree.
quadtree/src/point.rs	Switched from [f64; N] to [OrderedFloat<f64>; N], implemented Display, Default, and manual serdev (de)serialization, and adjusted APIs.
quadtree/Cargo.toml	Added dependencies on ordered-float, serdev, and test-only serde_json.

Comments suppressed due to low confidence (1)

quadtree/src/region.rs:38

• The change to pass a reference here isn't covered by existing tests. Consider adding unit tests for Region::contains with points inside and outside various intervals.

.all(|(interval, value)| interval.contains(&value))