integration with sktime

[ViktorKaz]

Integrate mlaut and sktime and ensure compatibility in the future

• Port strategies and tasks from sktime into mlaut.
• Port current state of benchmarking module from sktime into mlaut.
• Future development of the ecosystem of packages (sktime, skpro, skpref, mlaut) could lead to all packages using the same base package. Ensure compatibility by separating the base classes.
• Translate all mlaut estimators to strategies by using the sktime strategy class.
• Continue development by working through list in issue #141 in sktime

Current state of this implementation is under development in the imporved_workflow branch in the mlaut repo.