id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
807939559,MDExOlB1bGxSZXF1ZXN0NTczMDc1Mzkw,4909,Add dataarray scatter with 3d support,14371165,closed,0,,,12,2021-02-14T11:15:50Z,2024-03-13T21:43:14Z,2021-07-17T21:07:31Z,MEMBER,,0,pydata/xarray/pulls/4909,"<!-- Feel free to remove check-list items aren't relevant to your change -->

- [x] Closes #xxxx
- [x] Tests added
- [x] Passes `pre-commit run --all-files`
- [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`

Add scatter plots for dataarrays. Then later remove the dataset version and replace it with a thin wrapper in a similar fashion to #4820.

New stuff:
- [x] Legend now displays colors and sizes in  a similar fashion to Seaborn.
- [x] New parameter `z` which allows 3d scatter plots.

Example:
Using `ds = xr.tutorial.scatter_example_dataset()`:
![image](https://user-images.githubusercontent.com/14371165/107875697-b2a78a80-6ec1-11eb-9275-ee4ca60bb903.png)
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