REFACTOR: Change design to be central on the Request struct

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "jsonrpc"
-version = "0.14.1"
+version = "0.15.0-rc0"
 authors = ["Andrew Poelstra <apoelstra@wpsoftware.net>"]
 license = "CC0-1.0"
 homepage = "https://github.com/apoelstra/rust-jsonrpc/"
@@ -30,10 +30,16 @@ simple_uds = []
 # Enable Socks5 Proxy in transport
 proxy = ["socks"]
 
+# transport implementations
+tp-hyper = [ "hyper" ]
 
 [dependencies]
+async-trait = "0.1.53"
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1", features = [ "raw_value" ] }
+erased-serde = "0.3.20"
 
 base64 = { version = "0.13.0", optional = true }
 socks = { version = "0.3.4", optional = true}
+
+hyper = { version = "0.14.0", features = [ "client", "http1" ], optional = true }