feat: Implement Permit2

- Retrieve allowance data from an RPC
- Encode approvals:
  - Create PermitSingle (and PermitDetails)
  - Use alloy eip712 to get signing hash on typed data
  - Sign data
- Add chrono and alloy eip712 and signer-local to Cargo.toml

--- don't change below this line ---
ENG-4063 Took 1 hour 58 minutes

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src/encoding/user_approvals_manager.rs

@@ -1,6 +1,8 @@
 use num_bigint::BigUint;
 use tycho_core::Bytes;
 
+use crate::encoding::errors::EncodingError;
+
 #[allow(dead_code)]
 pub struct Approval {
     pub spender: Bytes,
@@ -11,5 +13,5 @@ pub struct Approval {
 
 pub trait UserApprovalsManager {
     #[allow(dead_code)]
-    fn encode_approvals(&self, approvals: Vec<Approval>) -> Vec<Vec<u8>>;
+    fn encode_approvals(&self, approvals: Vec<Approval>) -> Result<Vec<Vec<u8>>, EncodingError>;
 }