We need `build_axis` function for `Plot` object

[RicardoRyn]

I noticed that in the latest version of main branch (commit hash: 9d59fa06c941b5ac2a8759b472f5db24883c8a48), a new build_axis function has been introduced for Plot object. I really like this new feature, as it return an Axes object instead of Figure. However, it's not included in the current 0.2.0 release on PyPI.

Do you have an estimate for when this feature will be available in PyPI release?