itertools.chain should evaluate lazily

CPython:

>>> from itertools import *
>>> a = chain.from_iterable(repeat(range(2)))
>>> next(a)
0
>>> next(a)
1
>>> next(a)
0

RustPython does not evaluate lazily and the call to from_iterable never returns:

>>>>> from itertools import *
>>>>> a = chain.from_iterable(repeat(range(2)))

This test looks missing in CPython

Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

Ok, they are not interested in it. We will add it to extra_tests/snippets/stdlib_itertools.py.

In #3788 I added a similar test.

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