feat: add subquery endpoints, staking config and identity chain references

- Add staking, staking-rewards, history externalApi endpoints (subquery.pezkuwichain.io)
  for both Pezkuwi Relay and Asset Hub
- Add identityChain reference to People chain on Relay and Asset Hub
- Add stakingWiki link to wiki.pezkuwichain.io/staking
- Add pushSupport option to Asset Hub
- Add defaultBlockTime to Asset Hub additional config
- Regenerate all merged chain versions via sync script

pezkuwi-overlay/chains/pezkuwi-chains.json

@@ -32,8 +32,24 @@
       }
     ],
     "externalApi": {
-      "history": [],
-      "staking": []
+      "staking": [
+        {
+          "type": "subquery",
+          "url": "https://subquery.pezkuwichain.io"
+        }
+      ],
+      "staking-rewards": [
+        {
+          "type": "subquery",
+          "url": "https://subquery.pezkuwichain.io"
+        }
+      ],
+      "history": [
+        {
+          "type": "subquery",
+          "url": "https://subquery.pezkuwichain.io"
+        }
+      ]
     },
     "assets": [
       {
@@ -55,7 +71,9 @@
       "defaultBlockTimeMillis": 6000,
       "feeViaRuntimeCall": true,
       "disabledCheckMetadataHash": true,
-      "stakingMaxElectingVoters": 22500
+      "stakingMaxElectingVoters": 22500,
+      "identityChain": "58269e9c184f721e0309332d90cafc410df1519a5dc27a5fd9b3bf5fd2d129f8",
+      "stakingWiki": "https://wiki.pezkuwichain.io/staking"
     }
   },
   {
@@ -69,7 +87,8 @@
       "assethub-fees",
       "proxy",
       "multisig",
-      "fullSyncByDefault"
+      "fullSyncByDefault",
+      "pushSupport"
     ],
     "nodeSelectionStrategy": "roundRobin",
     "nodes": [
@@ -86,7 +105,26 @@
         "event": "https://explorer.pezkuwichain.io/asset-hub/event/{value}"
       }
     ],
-    "externalApi": {},
+    "externalApi": {
+      "staking-rewards": [
+        {
+          "type": "subquery",
+          "url": "https://subquery.pezkuwichain.io"
+        }
+      ],
+      "staking": [
+        {
+          "type": "subquery",
+          "url": "https://subquery.pezkuwichain.io"
+        }
+      ],
+      "history": [
+        {
+          "type": "subquery",
+          "url": "https://subquery.pezkuwichain.io"
+        }
+      ]
+    },
     "assets": [
       {
         "assetId": 0,
@@ -187,7 +225,10 @@
       "disabledCheckMetadataHash": true,
       "relaychainAsNative": true,
       "stakingMaxElectingVoters": 22500,
-      "timelineChain": "bb4a61ab0c4b8c12f5eab71d0c86c482e03a275ecdafee678dea712474d33d75"
+      "identityChain": "58269e9c184f721e0309332d90cafc410df1519a5dc27a5fd9b3bf5fd2d129f8",
+      "timelineChain": "bb4a61ab0c4b8c12f5eab71d0c86c482e03a275ecdafee678dea712474d33d75",
+      "defaultBlockTime": 6000,
+      "stakingWiki": "https://wiki.pezkuwichain.io/staking"
     }
   },
   {