feat: add SessionStateListener callback when a PossDup message with too-low MsgSeqNum is discarded#1259

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mvanhorn:fix/1254-2026-06-12-1151-feat-possdup-discard-callbackmvanhorn/quickfixj:fix/1254-2026-06-12-1151-feat-possdup-discard-callbackCopy head branch name to clipboard