fix: Make functions in encoding_utils.rs private

They shouldn't be used outside the crate by the users. They should reimplement this functions themselves.
Move encode_input to utils.rs

Took 8 minutes

src/encoding/evm/approvals/permit2.rs

@@ -17,10 +17,7 @@ use tycho_common::Bytes;
 
 use crate::encoding::{
     errors::EncodingError,
-    evm::{
-        encoding_utils::encode_input,
-        utils::{biguint_to_u256, bytes_to_address, get_client, get_runtime},
-    },
+    evm::utils::{biguint_to_u256, bytes_to_address, encode_input, get_client, get_runtime},
     models,
 };