Implement a cftime-compatible version of matplotlib's `ConciseDateFormatter`

[spencerkclark]

✨ Feature Request

A few years ago, matplotlib introduced a date formatter that helps to display date information in a more concise manner. It does so by minimizing the amount of duplicate information displayed in the tick labels through the axis offset label. See this example taken from their documentation:

It would be cool if nc-time-axis supported something similar.

Motivation

Datetime tick labels can often take up a lot of space. This feature in matplotlib does a nice job of minimizing that without losing information.