implement euclidean distance for all geometry types

[mcassels]

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

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

This change implements https://github.com/georust/geo/issues/979

[michaelkirk]

Hi @mcassels, are you still interested in working on this? Let me know if you have any questions.

If you don't think you'll have time, I can try to finish it up.

[mcassels]

@michaelkirk thanks for the review! I'm still planning to work on this, sorry for the delay -- been travelling with limited internet access. I'm hoping to get back to this within the next couple days

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• ci result

[JosiahParry]

Amazing!