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/src/blob_verification.rs

@@ -400,7 +400,7 @@ pub fn validate_blob_sidecar_for_gossip<T: BeaconChainTypes, O: ObservationStrat
     // since we only subscribe to `MaxBlobsPerBlock` subnets over gossip network.
     // We include this check only for completeness.
     // Getting this error would imply something very wrong with our networking decoding logic.
-    if blob_index >= T::EthSpec::max_blobs_per_block() as u64 {
+    if blob_index >= chain.spec.max_blobs_per_block(blob_epoch) {
         return Err(GossipBlobError::InvalidSubnet {
             expected: subnet,
             received: blob_index,