chore: fix clippy warnings and nightly fmt

src/encoding/approvals/interface.rs

@@ -1,6 +1,7 @@
 use num_bigint::BigUint;
 use tycho_core::Bytes;
 
+#[allow(dead_code)]
 pub struct Approval {
     pub spender: Bytes,
     pub owner: Bytes,
@@ -9,5 +10,6 @@ pub struct Approval {
 }
 
 pub trait UserApprovalsManager {
+    #[allow(dead_code)]
     fn encode_approvals(&self, approvals: Vec<Approval>) -> Vec<u8>;
 }