Wrapper for highlevel functionality

[lukasdreyer]

In some tutorials, there is a wrapper t8_forest_adapt, that sets the appropriate flags and commits and returns the adapted forest.

This functionality would be nice to have in the public interface for all highlevel-functionality

Feature request

Describe the solution or feature you'd like
Introduce wrappers for all high-level functionality

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Estimated priority
Which of these is most applicable (remove the others):

"Priority: low" Should be solved eventually

Additional context
Add any other context or screenshots about the feature request here.