feat: add mekong chain (#2984)

* Create mekong.ts

* Update mekong.ts

* Update index.ts

* Update mekong.ts

* Remove space committed by error

* Create small-cheetahs-applaud.md

---------

Co-authored-by: jxom <7336481+jxom@users.noreply.github.com>

.changeset/small-cheetahs-applaud.md

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

src/chains/definitions/mekong.ts

@@ -0,0 +1,19 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const mekong = /*#__PURE__*/ defineChain({
+  id: 7078815900,
+  name: 'Mekong Pectra Devnet',
+  nativeCurrency: { name: 'eth', symbol: 'eth', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.mekong.ethpandaops.io'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Block Explorer',
+      url: 'https://explorer.mekong.ethpandaops.io',
+    },
+  },
+  testnet: true,
+})

src/chains/index.ts

@@ -238,6 +238,7 @@ export { mantleTestnet } from './definitions/mantleTestnet.js'
 export { mapProtocol } from './definitions/mapProtocol.js'
 export { matchain } from './definitions/matchain.js'
 export { matchainTestnet } from './definitions/matchainTestnet.js'
+export { mekong } from './definitions/mekong.js';
 export { meld } from './definitions/meld.js'
 export { merlin } from './definitions/merlin.js'
 export { metachain } from './definitions/metachain.js'