gh-108278: Deprecate passing the three first params as keyword args for sqlite3 UDF creation APIs (#108281)

Deprecate passing name, number of arguments, and the callable as keyword
arguments, for the following sqlite3.Connection APIs:

- create_function(name, nargs, callable, ...)
- create_aggregate(name, nargs, callable)

The affected parameters will become positional-only in Python 3.15.