Use serde instead of hand-rolled serialization

Port of evmar#18

Author: GrigorenkoPV

Cargo.lock

@@ -13,6 +13,13 @@ anyhow = "1.0"
 libc = "0.2"
 lazy_static = "1.4.0"
 
+[dependencies.serde]
+version = "1.0"
+features = ["std", "derive"]
+
+[dependencies.serde_cbor]
+version = "0.11"
+
 [target.'cfg(windows)'.dependencies]
 kernel32-sys = "0.2.2"
 winapi = { version = "0.3.6", features = [ "processenv", "consoleapi", "synchapi" ] }