Preparing backend to receive data from shards (#337)

* Move backend to backend/core

* Ported shard receiver WIP

* Remove dead code

backend/core/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "telemetry"
+version = "0.3.0"
+authors = ["Parity Technologies Ltd. <admin@parity.io>"]
+edition = "2018"
+license = "GPL-3.0"
+
+[dependencies]
+actix = "0.11.1"
+actix-web = { version = "4.0.0-beta.4", default-features = false }
+actix-web-actors = "4.0.0-beta.3"
+actix-http = "3.0.0-beta.4"
+bincode = "1.3.3"
+bytes = "1.0.1"
+chrono = { version = "0.4", features = ["serde"] }
+fnv = "1.0.7"
+hex = "0.4.3"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0", features = ["raw_value"] }
+thiserror = "1.0.24"
+primitive-types = { version = "0.9.0", features = ["serde"] }
+log = "0.4"
+simple_logger = "1.11.0"
+num-traits = "0.2"
+parking_lot = "0.11"
+reqwest = { version = "0.11.1", features = ["blocking", "json"] }
+rustc-hash = "1.1.0"
+clap = "3.0.0-beta.2"
+ctor = "0.1.20"