* add proto
* add rpc and interfaces
* add protocol implementation
* update faulty proto def
* add rpc and interfaces
* refactor implementation & write test
* setup the metadata protocol as a service
* fix cases where metadata service needs to be undefined
* remove redundant catch block
* remove addressed TODO
* update import path
* log errors
* remove redundant code from handling incoming metadata request
* update tests
* add test to check for active connections
* change expects
* save remote peer's shard info after successful connection
