Refactor chanmon consistency harness state

Move chanmon_consistency.rs state and orchestration into
Harness, HarnessNode, EventQueues, PaymentTracker, and
PeerLink. This pushes reload, sync, monitor completion,
splice, queue handling, restart, and settle-all behavior
onto owned methods instead of local macros, closures, and
parameter-heavy helper plumbing.

Keep do_test focused on opcode dispatch while preserving
the existing harness behavior.

Author: joostjager