chore: Use tycho_core::dto objects instead of tycho_core::models

--- don't change below this line ---
ENG-4169 Took 11 minutes

src/encoding/strategy_encoder.rs

@@ -1,4 +1,4 @@
-use tycho_core::{models::Chain, Bytes};
+use tycho_core::{dto::Chain, Bytes};
 
 use crate::encoding::{errors::EncodingError, models::Solution, swap_encoder::SwapEncoder};