Fix pipeline/split function

[alexkunde]

Changes

Fixes

• When splitting Unit Type from Unitname it should split the right most . so Units with dots in the name correctly split.
• Docs where previously ignored in the last commit, this will fix it.

Improvements

• Update Github Actions to use cargo nextest run nextest
• Update Github Actions to cache dependencies, this will reduce pipeline runtime by a lot

[gwbres]

Thank you @alexkunde for your very good contributions,
I'll publish a new version of this lib in the next few days