[BIP-646] Enable instETH-wstETH Gauge Arbitrum

Enable Gauge on Arbitrum for instETH/wstETH.
Rate provider review: balancer/code-review#91
Proposal: https://forum.balancer.fi/t/bip-xxx-enable-gauge-for-insteth-wsteth-arbitrum/5834

BIPs/2024-W27/[BIP-646] Enable instETH-wstETH Gauge Arbitrum.json

@@ -0,0 +1,32 @@
+{
+  "version": "1.0",
+  "chainId": "1",
+  "createdAt": 1719453944273,
+  "meta": {
+    "name": "Transactions Batch",
+    "description": "",
+    "txBuilderVersion": "1.16.5",
+    "createdFromSafeAddress": "0xc38c5f97B34E175FFd35407fc91a937300E33860",
+    "createdFromOwnerAddress": "",
+    "checksum": "0xe89c7ee72dc7285fe5688eabff4aa7157813524eb06e3c97784436a9cd9367eb"
+  },
+  "transactions": [
+    {
+      "to": "0x5DbAd78818D4c8958EfF2d5b95b28385A22113Cd",
+      "value": "0",
+      "data": null,
+      "contractMethod": {
+        "inputs": [
+          { "internalType": "address", "name": "gauge", "type": "address" },
+          { "internalType": "string", "name": "gaugeType", "type": "string" }
+        ],
+        "name": "addGauge",
+        "payable": false
+      },
+      "contractInputsValues": {
+        "gauge": "0x82bc385C57447188de50Ba8237210cAaA43a0BB3",
+        "gaugeType": "Arbitrum"
+      }
+    }
+  ]
+}