Runtime rpc request sizes (#4841)

* add runtime variable list type

* add configs to ChainSpec

* git rid of max request blocks type

* fix tests and lints

* remove todos

* git rid of old const usage

* fix decode impl

* add new config to `Config` api struct

* add docs fix compilt

* move methods for per-fork-spec to chainspec

* get values off chain spec

* fix compile

* remove min by root size

* add tests for runtime var list

---------

Co-authored-by: Jimmy Chen <jchen.tc@gmail.com>

beacon_node/beacon_chain/src/data_availability_checker.rs

@@ -22,7 +22,6 @@ use std::sync::Arc;
 use task_executor::TaskExecutor;
 use types::beacon_block_body::{KzgCommitmentOpts, KzgCommitments};
 use types::blob_sidecar::{BlobIdentifier, BlobSidecar, FixedBlobSidecarList};
-use types::consts::deneb::MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS;
 use types::{BlobSidecarList, ChainSpec, Epoch, EthSpec, Hash256, SignedBeaconBlock, Slot};
 
 mod availability_view;
@@ -424,7 +423,8 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
                 .map(|current_epoch| {
                     std::cmp::max(
                         fork_epoch,
-                        current_epoch.saturating_sub(MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS),
+                        current_epoch
+                            .saturating_sub(self.spec.min_epochs_for_blob_sidecars_requests),
                     )
                 })
         })
@@ -517,7 +517,8 @@ async fn availability_cache_maintenance_service<T: BeaconChainTypes>(
                 let cutoff_epoch = std::cmp::max(
                     finalized_epoch + 1,
                     std::cmp::max(
-                        current_epoch.saturating_sub(MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS),
+                        current_epoch
+                            .saturating_sub(chain.spec.min_epochs_for_blob_sidecars_requests),
                         deneb_fork_epoch,
                     ),
                 );