DOC: Add an example working with uxarray

[mgrover1]

• xradar version: All
• Python version: All
• Operating System: All

Description

Add an example fitting xradar datasets/datatrees into uxarray, properly representing the gate centers and edges. This could be accompanied by an accessor that transform the datatree/dataset for the user as well 👍

This will make the downstream functions in wradlib/py-art much easier to maintain, and allows us to take advantage of some neat functionality on the uxarray side

see related issue here UXARRAY/uxarray#976

[kmuehlbauer]

@mgrover1 Looking forward to it.