gh-126703: Add freelists for list and tuple iterators

[eendebakpt]

See the corresponding issue for allocation statistics and see #128368 for more discussion.

• Issue: Use freelist for range object, iterator objects and other often used objects #126703

[markshannon]

Benchmarks show a 0.7% speedup, with no obvious pattern. This could be noise or a real speedup.

Stats coming up...

[eendebakpt]

The stats are there: https://github.com/faster-cpython/benchmarking-public/blob/main/results/bm-20250127-3.14.0a4%2B-b2dd84b/bm-20250127-azure-x86_64-eendebakpt-iterator_freelists-3.14.0a4%2B-b2dd84b-pystats-vs-base.md

If I interpret correctly, we have 16% less allocations and 10% more objects from the freelist.

The performance increase of 0.7% is roughly in line with the 0.2% increase from (#128692) if I look at the number of allocations avoided (see #126703 (comment), about 348M allocations for this PR, 165 PR for the other PR). (within noise of the benchmarks)

[markshannon]

Looks good. Thanks.