added custody group count in node/identity endpoint (#7046)

* added custody group count in node/identity endpoint

* fix copyright year

Author: agnxsh

beacon_chain/rpc/rest_node_api.nim

@@ -1,4 +1,4 @@
-# Copyright (c) 2021-2024 Status Research & Development GmbH
+# Copyright (c) 2021-2025 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
@@ -164,7 +164,8 @@ proc installNodeApiHandlers*(router: var RestRouter, node: BeaconNode) =
         metadata: (
           seq_number: node.network.metadata.seq_number,
           syncnets: to0xHex(node.network.metadata.syncnets.bytes),
-          attnets: to0xHex(node.network.metadata.attnets.bytes)
+          attnets: to0xHex(node.network.metadata.attnets.bytes),
+          custody_group_count: node.network.metadata.custody_group_count
         )
       )
     )

beacon_chain/spec/eth2_apis/rest_types.nim

@@ -274,6 +274,7 @@ type
     seq_number*: string
     syncnets*: string
     attnets*: string
+    custody_group_count*: string
 
   RestNetworkIdentity* = object
     peer_id*: string

ncli/resttest-rules.json

@@ -4265,7 +4265,7 @@
     "response": {
       "status": {"operator": "equals", "value": "200"},
       "headers": [{"key": "Content-Type", "value": "application/json", "operator": "equals"}],
-      "body": [{"operator": "jstructcmps", "start": ["data"], "value": {"peer_id": "", "enr": "", "p2p_addresses": [""], "discovery_addresses": [""], "metadata": {"seq_number": "", "attnets": "", "syncnets": ""}}}]
+      "body": [{"operator": "jstructcmps", "start": ["data"], "value": {"peer_id": "", "enr": "", "p2p_addresses": [""], "discovery_addresses": [""], "metadata": {"seq_number": "", "attnets": "", "syncnets": "", "custody_group_count": ""}}}]
     }
   },
   {