Palindromic Pair Lie-Trotter-Godunov

[termi-official]

This PR adds the simplest method to adapt the time step length for first order operator splitting schemes.

TODO

• Separate controller from its cache
• Remove enforcement of dt in subintegrators
• Add minimalistic intermediate integrators for recursive problems instead of just having a tuple to allow nesting of adaptive integrators

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.