GH-108362: Incremental GC implementation - #116199
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Implements incremental cyclic GC.
Instead of traversing one generation on each collection, we traverse the young generation and the oldest part of the old generation. By traversing the old generation a chunk at a time, we keep pause times down a lot.
See faster-cpython/ideas#613 for the idea and algorithm.
Earlier PR that needed reverting: #108038