rpcclient: provide some exported error for disconnected WSClient #3000
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Regular Client doesn't care much about connections, because HTTP client's Do method can reuse old ones or create additional ones on the fly. So one request can fail and the next one easily succeed. WSClient is different, it works via a single connection and if it breaks, it breaks forever for this client. Callers will get some error on every request afterwards and it'd be nice for this error to be the same so that API users could detect disconnection this way too.
Related to nspcc-dev/neofs-node#2325.