feat: Introduce shared codec lib (#71)

closes #65

pallas-primitives/src/framework.rs

@@ -1,5 +1,7 @@
 pub type Error = Box<dyn std::error::Error>;
 
+use pallas_codec::minicbor::{decode, to_vec, Decode, Encode};
+
 pub trait Fragment<'a>
 where
     Self: Sized,
@@ -10,14 +12,14 @@ where
 
 impl<'a, T> Fragment<'a> for T
 where
-    T: minicbor::Encode + minicbor::Decode<'a> + Sized,
+    T: Encode + Decode<'a> + Sized,
 {
     fn encode_fragment(&self) -> Result<Vec<u8>, Error> {
-        minicbor::to_vec(self).map_err(|e| e.into())
+        to_vec(self).map_err(|e| e.into())
     }
 
     fn decode_fragment(bytes: &'a [u8]) -> Result<Self, Error> {
-        minicbor::decode(bytes).map_err(|e| e.into())
+        decode(bytes).map_err(|e| e.into())
     }
 }