perf(l1): make trusted setup warmup non blocking (#5124)

**Motivation**
Warmup takes ~3 seconds and makes the node start up slower unnecessarily

**Description**
- Makes the warmup behind a thread so it's not blocking

---------

Co-authored-by: Mario Rugiero <[email protected]>

Author: mpaulucci

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Perf
 
+### 2025-10-30
+
+- Make trusted setup warmup non blocking [#5124](https://github.com/lambdaclass/ethrex/pull/5124)
+
 ### 2025-10-28
 
 - Batch BlobsBundle::validate [#4993](https://github.com/lambdaclass/ethrex/pull/4993)

crates/common/crypto/kzg.rs

@@ -24,11 +24,15 @@ type Blob = [u8; BYTES_PER_BLOB];
 type Commitment = Bytes48;
 type Proof = Bytes48;
 
-/// Ensures the Ethereum trusted setup is loaded so later KZG operations avoid the first-call cost.
+/// Schedules the Ethereum trusted setup to load on a background thread so later KZG operations avoid the first-call cost.
 pub fn warm_up_trusted_setup() {
     #[cfg(feature = "c-kzg")]
     {
-        std::hint::black_box(c_kzg::ethereum_kzg_settings(KZG_PRECOMPUTE));
+        let _ = std::thread::Builder::new()
+            .name("kzg-warmup".into())
+            .spawn(|| {
+                std::hint::black_box(c_kzg::ethereum_kzg_settings(KZG_PRECOMPUTE));
+            });
     }
 }