use ws_client in shard, too, and make it better at handling core disconnecting

backend/common/Cargo.toml

@@ -9,14 +9,19 @@ license = "GPL-3.0"
 bimap = "0.6.1"
 bytes = "1.0.1"
 fnv = "1.0.7"
+futures = "0.3.15"
 hex = "0.4.3"
+http = "0.2.4"
 log = "0.4"
 num-traits = "0.2"
 primitive-types = { version = "0.9.0", features = ["serde"] }
 rustc-hash = "1.1.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", features = ["raw_value"] }
+soketto = "0.6.0"
 thiserror = "1.0.24"
+tokio = { version = "1.8.2", features = ["full"] }
+tokio-util = { version = "0.6", features = ["compat"] }
 
 [dev-dependencies]
 bincode = "1.3.3"