Implement PeerDAS subnet decoupling (aka custody groups) (#6736)

* Implement PeerDAS subnet decoupling (aka custody groups).

* Merge branch 'unstable' into decouple-subnets

* Refactor feature testing for spec tests (#6737)

Squashed commit of the following:

commit 898d05ee17
Merge: ffbd25e2b 7e0cddef3
Author: Jimmy Chen <jchen.tc@gmail.com>
Date:   Tue Dec 24 14:41:19 2024 +1100

    Merge branch 'unstable' into refactor-ef-tests-features

commit ffbd25e2be
Author: Jimmy Chen <jchen.tc@gmail.com>
Date:   Tue Dec 24 14:40:38 2024 +1100

    Fix `SszStatic` tests for PeerDAS: exclude eip7594 test vectors when testing Electra types.

commit aa593cf35c
Author: Jimmy Chen <jchen.tc@gmail.com>
Date:   Fri Dec 20 12:08:54 2024 +1100

    Refactor spec testing for features and simplify usage.

* Fix build.

* Add input validation and improve arithmetic handling when calculating custody groups.

* Address review comments re code style consistency.

* Merge branch 'unstable' into decouple-subnets

# Conflicts:
#	beacon_node/beacon_chain/src/kzg_utils.rs
#	beacon_node/beacon_chain/src/observed_data_sidecars.rs
#	beacon_node/lighthouse_network/src/discovery/subnet_predicate.rs
#	common/eth2_network_config/built_in_network_configs/chiado/config.yaml
#	common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
#	common/eth2_network_config/built_in_network_configs/holesky/config.yaml
#	common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
#	common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
#	consensus/types/src/chain_spec.rs

* Update consensus/types/src/chain_spec.rs

Co-authored-by: Lion - dapplion <35266934+dapplion@users.noreply.github.com>

* Merge remote-tracking branch 'origin/unstable' into decouple-subnets

* Update error handling.

* Address review comment.

* Merge remote-tracking branch 'origin/unstable' into decouple-subnets

# Conflicts:
#	consensus/types/src/chain_spec.rs

* Update PeerDAS spec tests to `1.5.0-beta.0` and fix failing unit tests.

* Merge remote-tracking branch 'origin/unstable' into decouple-subnets

# Conflicts:
#	beacon_node/lighthouse_network/src/peer_manager/mod.rs

testing/ef_tests/src/cases/get_custody_groups.rs

@@ -0,0 +1,54 @@
+use super::*;
+use alloy_primitives::U256;
+use serde::Deserialize;
+use std::marker::PhantomData;
+use types::data_column_custody_group::get_custody_groups;
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(bound = "E: EthSpec", deny_unknown_fields)]
+pub struct GetCustodyGroups<E: EthSpec> {
+    /// The NodeID input.
+    pub node_id: String,
+    /// The count of custody groups.
+    pub custody_group_count: u64,
+    /// The list of resulting custody groups.
+    pub result: Vec<u64>,
+    #[serde(skip)]
+    _phantom: PhantomData<E>,
+}
+
+impl<E: EthSpec> LoadCase for GetCustodyGroups<E> {
+    fn load_from_dir(path: &Path, _fork_name: ForkName) -> Result<Self, Error> {
+        decode::yaml_decode_file(path.join("meta.yaml").as_path())
+    }
+}
+
+impl<E: EthSpec> Case for GetCustodyGroups<E> {
+    fn is_enabled_for_fork(_fork_name: ForkName) -> bool {
+        false
+    }
+
+    fn is_enabled_for_feature(feature_name: FeatureName) -> bool {
+        feature_name == FeatureName::Fulu
+    }
+
+    fn result(&self, _case_index: usize, _fork_name: ForkName) -> Result<(), Error> {
+        let spec = E::default_spec();
+        let node_id = U256::from_str_radix(&self.node_id, 10)
+            .map_err(|e| Error::FailedToParseTest(format!("{e:?}")))?;
+        let raw_node_id = node_id.to_be_bytes::<32>();
+        let mut computed = get_custody_groups(raw_node_id, self.custody_group_count, &spec)
+            .map(|set| set.into_iter().collect::<Vec<_>>())
+            .expect("should compute custody groups");
+        computed.sort();
+
+        let expected = &self.result;
+        if computed == *expected {
+            Ok(())
+        } else {
+            Err(Error::NotEqual(format!(
+                "Got {computed:?}\nExpected {expected:?}"
+            )))
+        }
+    }
+}