chore: Merge Byron / Alonzo into single crate (#43)

pallas-primitives/src/framework.rs

@@ -0,0 +1,22 @@
+pub type Error = Box<dyn std::error::Error>;
+
+pub trait Fragment<'a>
+where
+    Self: Sized,
+{
+    fn encode_fragment(&self) -> Result<Vec<u8>, Error>;
+    fn decode_fragment(bytes: &'a [u8]) -> Result<Self, Error>;
+}
+
+impl<'a, T> Fragment<'a> for T
+where
+    T: minicbor::Encode + minicbor::Decode<'a> + Sized,
+{
+    fn encode_fragment(&self) -> Result<Vec<u8>, Error> {
+        minicbor::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())
+    }
+}