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Streamline DefaultChannelPool checkout and close paths - #2183
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Motivation:
DefaultChannelPool allocates a fresh IdleChannel holder on every keep-alive checkout and scans the partition deque O(n) to remove a channel on close.
Modification:
Store the bare Channel in the deque with idle state (timestamp + owned flag) on a reused per-channel attribute, and make removeAll an O(1) tombstone that the idle cleaner unlinks lazily.
Result:
Behavior-preserving; checkout drops 56 -to- 24 B/op and removeAll goes from O(n) to O(1) (depth-independent), per JMH on JDK 11.