feat: add sanko chain (wevm#2895)

.changeset/cuddly-schools-visit.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Sanko chain.

src/chains/definitions/sanko.ts

@@ -0,0 +1,19 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const sanko = /*#__PURE__*/ defineChain({
+  id: 1996,
+  name: 'Sanko',
+  nativeCurrency: { name: 'DMT', symbol: 'DMT', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://mainnet.sanko.xyz'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Sanko Explorer',
+      url: 'https://explorer.sanko.xyz',
+    },
+  },
+  testnet: false,
+})

src/chains/index.ts

@@ -298,6 +298,7 @@ export { rootstockTestnet } from './definitions/rootstockTestnet.js'
 export { rss3 } from './definitions/rss3.js'
 export { rss3Sepolia } from './definitions/rss3Sepolia.js'
 export { saigon } from './definitions/saigon.js'
+export { sanko } from './definitions/sanko.js'
 export { sapphire } from './definitions/sapphire.js'
 export { sapphireTestnet } from './definitions/sapphireTestnet.js'
 export { satoshiVM } from './definitions/satoshivm.js'