Reclaim idle connections across routes in RouteSegmentedConnPool - #722
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RouteSegmentedConnPoolcurrently stops allocating when the global limit is reached, even if another route holds an idle reusable entry.This change allows the pool to reclaim an idle entry from another route and transfer the global allocation slot to the requesting route.
The hot path remains route-local. Cross-route reclamation is only attempted when normal allocation cannot proceed because
maxTotalhas been reached.It also ensures pending routes are retried when global capacity becomes available, while avoiding unnecessary drain activity for routes already at their per-route limit.
Benchmarks show no regression on the hot path and improved throughput for the full-pool cross-route case.