Implement `From<&Line>` for `LineString`

[gibbz00]

• [x] I agree to follow the project's code of conduct.

• [x] I added an entry to CHANGES.md if knowledge of this change could be valuable to users.

Manual implementation tends to be implemented inline (e.g https://github.com/frewsxcv/geo-bevy/blob/348085c43b58da8f321e04e77fa9bf7d624e60b4/src/lib.rs#L147) as From<Line> is possibly more restrictive than necessary. Not sure whether From<Line> uses copy over move even if it's an owned parameter.

[lnicola]

bors r+

[bors[bot]]

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• ci result