[bugfix] Release task resources#129
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Co-authored-by: zhuofan1123 <zhuofanl@nvidia.com>
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FlexKV's ·KVTaskManager.tasks· (ExpiringDict, TTL=30min) retains completed KVTask objects long after they are consumed. Each KVTask holds ~16 Python objects. This causes python GC pause time to grow.
This PR fix: pop tasks from ExpiringDict when consumed (
_wait_impl) or cancelled (_cancel_task)