perf(l1): avoid copy when reading account code (#5289)

**Motivation**

Currently we use `get_cf` for reading codes, which internally calls
`get_pinned_cf` and copies the result.  This copying takes up 6% of code
reading time.

**Description**

Since data needs to be deserialized first, we could use a borrowed value
and avoid this copy by calling `get_pinned_cf` directly.

Author: iovoid

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### 2025-11-12
 
+- Avoid copying while reading account code [#5289](https://github.com/lambdaclass/ethrex/pull/5289)
 - Cache `BLOBBASEFEE` opcode value [#5288](https://github.com/lambdaclass/ethrex/pull/5288)
 
 ### 2025-11-11

crates/storage/store_db/rocksdb.rs

@@ -1306,11 +1306,14 @@ impl StoreEngine for Store {
     }
 
     fn get_account_code(&self, code_hash: H256) -> Result<Option<Code>, StoreError> {
-        let hash_key = code_hash.as_bytes().to_vec();
-        let Some(bytes) = self.read_sync(CF_ACCOUNT_CODES, hash_key)? else {
+        let cf = self.cf_handle(CF_ACCOUNT_CODES)?;
+        let Some(bytes) = self
+            .db
+            .get_pinned_cf(&cf, code_hash.as_bytes())
+            .map_err(|e| StoreError::Custom(format!("RocksDB read error: {}", e)))?
+        else {
             return Ok(None);
         };
-        let bytes = Bytes::from_owner(bytes);
         let (bytecode, targets) = decode_bytes(&bytes)?;
         let code = Code {
             hash: code_hash,