Make max_blobs_per_block a config parameter (#6329)

* First pass

* Add restrictions to RuntimeVariableList api

* Use empty_uninitialized and fix warnings

* Fix some todos

* Merge branch 'unstable' into max-blobs-preset

* Fix take impl on RuntimeFixedList

* cleanup

* Fix test compilations

* Fix some more tests

* Fix test from unstable

* Merge branch 'unstable' into max-blobs-preset

* Merge remote-tracking branch 'origin/unstable' into max-blobs-preset

* Remove footgun function

* Minor simplifications

* Move from preset to config

* Fix typo

* Revert "Remove footgun function"

This reverts commit de01f923c7.

* Try fixing tests

* Thread through ChainSpec

* Fix release tests

* Move RuntimeFixedVector into module and rename

* Add test

* Remove empty RuntimeVarList awefullness

* Fix tests

* Simplify BlobSidecarListFromRoot

* Merge remote-tracking branch 'origin/unstable' into max-blobs-preset

* Bump quota to account for new target (6)

* Remove clone

* Fix issue from review

* Try to remove ugliness

* Merge branch 'unstable' into max-blobs-preset

* Fix max value

* Fix doctest

* Fix formatting

* Fix max check

* Delete hardcoded max_blobs_per_block in RPC limits

* Merge remote-tracking branch 'origin/unstable' into max-blobs-preset

beacon_node/beacon_chain/tests/block_verification.rs

@@ -65,12 +65,13 @@ async fn get_chain_segment() -> (Vec<BeaconSnapshot<E>>, Vec<Option<BlobSidecarL
             beacon_block: Arc::new(full_block),
             beacon_state: snapshot.beacon_state,
         });
-        segment_blobs.push(Some(
+        segment_blobs.push(
             harness
                 .chain
                 .get_blobs(&snapshot.beacon_block_root)
-                .unwrap(),
-        ))
+                .unwrap()
+                .blobs(),
+        );
     }
     (segment, segment_blobs)
 }
@@ -110,8 +111,9 @@ async fn get_chain_segment_with_blob_sidecars(
         let blob_sidecars = harness
             .chain
             .get_blobs(&snapshot.beacon_block_root)
-            .unwrap();
-        segment_blobs.push(Some(blob_sidecars))
+            .unwrap()
+            .blobs();
+        segment_blobs.push(blob_sidecars)
     }
     (segment, segment_blobs)
 }
@@ -206,7 +208,7 @@ fn update_blob_signed_header<E: EthSpec>(
     signed_block: &SignedBeaconBlock<E>,
     blobs: &mut BlobSidecarList<E>,
 ) {
-    for old_blob_sidecar in blobs.iter_mut() {
+    for old_blob_sidecar in blobs.as_mut_slice() {
         let new_blob = Arc::new(BlobSidecar::<E> {
             index: old_blob_sidecar.index,
             blob: old_blob_sidecar.blob.clone(),
@@ -1223,7 +1225,7 @@ async fn verify_block_for_gossip_slashing_detection() {
     let slasher = Arc::new(
         Slasher::open(
             SlasherConfig::new(slasher_dir.path().into()),
-            spec,
+            spec.clone(),
             test_logger(),
         )
         .unwrap(),
@@ -1247,7 +1249,7 @@ async fn verify_block_for_gossip_slashing_detection() {
 
     if let Some((kzg_proofs, blobs)) = blobs1 {
         let sidecars =
-            BlobSidecar::build_sidecars(blobs, verified_block.block(), kzg_proofs).unwrap();
+            BlobSidecar::build_sidecars(blobs, verified_block.block(), kzg_proofs, &spec).unwrap();
         for sidecar in sidecars {
             let blob_index = sidecar.index;
             let verified_blob = harness