tasks: simulation: split out flash storage api bits into separate mod

src/simdata.rs

@@ -97,7 +97,7 @@ impl RmpData for StreamHeader {
         }
     }
 
-    fn write_rmp<Writer: RmpWrite>(&self, writer: &mut Writer) -> Result<(), ValueWriteError<Writer::Error>> {
+    fn write_rmp<Writer: RmpWrite>(&self, _writer: &mut Writer) -> Result<(), ValueWriteError<Writer::Error>> {
         todo!()
     }
 }