Handle GC cycles properly in intl iterators

This is a follow-up on GH-17343 to implement GC cycle management.
Previously the objects lived too long due to the strong cycle.
This patc

Handle GC cycles properly in intl iterators

This is a follow-up on GH-17343 to implement GC cycle management.
Previously the objects lived too long due to the strong cycle.
This patch adds get_gc handlers to break the cycle.

Closes GH-17355.

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