chore: Make objects public

Remove dead_code check and leftover file after a merge
Improve some docstrings

--- don't change below this line ---
ENG-4087 Took 1 hour 39 minutes

src/encoding/evm/approvals/permit2.rs

@@ -60,7 +60,6 @@ sol! {
     }
 }
 
-#[allow(dead_code)]
 impl Permit2 {
     pub fn new(signer_pk: String, chain: Chain) -> Result<Self, EncodingError> {
         let chain_id = ChainId::from(chain);