change transaction value fields from u128 to a wrapper-type of U256 (#4439)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/storage/codecs/derive/src/compact/mod.rs

@@ -164,6 +164,11 @@ pub fn get_bit_size(ftype: &str) -> u8 {
         "u64" | "BlockNumber" | "TxNumber" | "ChainId" | "NumTransactions" => 4,
         "u128" => 5,
         "U256" => 6,
+        #[cfg(not(feature = "value-256"))]
+        "TxValue" => 5, // u128 for ethereum chains assuming high order bits are not used
+        #[cfg(feature = "value-256")]
+        // for fuzz/prop testing and chains that may require full 256 bits
+        "TxValue" => 6,
         _ => 0,
     }
 }