refactor(agents): chain-centric watcher #224
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Motivation
An operator running a watcher is typically an app owner or L1 partner (chain-centric). In the current, home-centric agent design, they must currently run N watcher instances for each home<>replica channel leading to the chain of interest (high operational burden). A chain-centric watcher would lower that operational burden as well as simplify watcher funding.
Solution
Refactor watcher to watch over all incoming connections to a chain.
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