[event-watcher] Create service boilerplate #398
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Description
This pull request implements the boilerplate for a new service named
event-watcher
(for lack of a better name).As the name implies, the service listens for events in the core layer contracts. In particular, we're interested in monitoring the transactions that generate VAAs. The service persists that information in MongoDB.
For each chain, the service has a connector that monitors events in that chain's core layer contract.