Feature parity with Python 3.14

[maxfischer2781]

This PR mirrors features implemented with Python 3.14. Major changes include:

• added strict: bool parameter to map to check for equal length argument iterables
  • it is now a TypeError not to provide any argument iterable
• the parameters of functools.reduce now follow the CPython 3.14 C implementation for positional-only and keyword arguments
• The asyncio.iscoroutinefunction() is no longer used and replaced by inspect.iscoroutinefunction() consistently

Closes #189, closes #195.