feat: add next generation reservoir computing

[MartinuzziFrancesco]

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

This PR adds the next generation reservoir computing models (NGRC). Given the difference of NGRC compared to the main model of the library (ESNs) there's a bit of a list of things to take care of:

• dispatch on resetcarry! to have it warn that there is no carry to reset
• add a documentation page that at least shows one example of the paper (Lorenz should do it)
• maybe add a utility function that provides the monomial expansion functions that they use in the paper to make it easier for the users
• add citation in .bib

closes #108