fix: Get correct runtime everywhere

Made an utils function for it to make sure it is used correctly

--- don't change below this line ---
ENG-4260 Took 9 minutes

src/encoding/evm/utils.rs

@@ -1,7 +1,8 @@
-use std::cmp::max;
+use std::{cmp::max, sync::Arc};
 
 use alloy_primitives::{aliases::U24, keccak256, Address, FixedBytes, Keccak256, U256, U8};
 use num_bigint::BigUint;
+use tokio::runtime::{Handle, Runtime};
 use tycho_core::Bytes;
 
 use crate::encoding::{
@@ -120,3 +121,15 @@ pub fn get_static_attribute(swap: &Swap, attribute_name: &str) -> Result<Vec<u8>
         })?
         .to_vec())
 }
+
+pub fn get_runtime() -> Result<(Handle, Option<Arc<Runtime>>), EncodingError> {
+    match Handle::try_current() {
+        Ok(h) => Ok((h, None)),
+        Err(_) => {
+            let rt = Arc::new(Runtime::new().map_err(|_| {
+                EncodingError::FatalError("Failed to create a new tokio runtime".to_string())
+            })?);
+            Ok((rt.handle().clone(), Some(rt)))
+        }
+    }
+}