Added string and bytes formatting

+ String fields are always null terminated and have a max length
+ Byte fields are made of raw bytes, and read data until they hit a max length or the end of data is reached

src/byte_stream/mod.rs

@@ -72,6 +72,10 @@ impl ByteStream {
 
         Ok(byte_stream)
     }
+
+    pub fn len(&self) -> usize {
+        self.data.len()
+    }
 }
 
 impl From<&[u8]> for ByteStream {