Add etherlink chain (#7634)

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## PR-Codex overview
This PR introduces new blockchain definitions for the Etherlink mainnet and testnet, enhancing the `thirdweb` package with additional chain support.

### Detailed summary
- Added `etherlink` mainnet definition in `packages/thirdweb/src/chains/chain-definitions/etherlink.ts`.
- Added `etherlinkTestnet` definition in `packages/thirdweb/src/chains/chain-definitions/etherlink-testnet.ts`.
- Exported `etherlink` and `etherlinkTestnet` in `packages/thirdweb/src/exports/chains.ts`.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **New Features**
  * Added support for the Etherlink mainnet and Etherlink testnet blockchain networks.
  * Users can now interact with these new chains within the platform.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: Yash094

.changeset/early-shoes-tap.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+feat(chains): add Etherlink mainnet and testnet chains

packages/thirdweb/src/chains/chain-definitions/etherlink-testnet.ts

@@ -0,0 +1,21 @@
+import { defineChain } from "../utils.js";
+
+/**
+ * @chain
+ */
+export const etherlinkTestnet = /* @__PURE__ */ defineChain({
+  blockExplorers: [
+    {
+      name: "Etherlink Testnet Explorer",
+      url: "https://testnet.explorer.etherlink.com/",
+    },
+  ],
+  id: 128123,
+  name: "Etherlink Testnet",
+  nativeCurrency: {
+    decimals: 18,
+    name: "Etherlink",
+    symbol: "XTZ",
+  },
+  testnet: true,
+});

packages/thirdweb/src/chains/chain-definitions/etherlink.ts

@@ -0,0 +1,20 @@
+import { defineChain } from "../utils.js";
+
+/**
+ * @chain
+ */
+export const etherlink = /* @__PURE__ */ defineChain({
+  blockExplorers: [
+    {
+      name: "Etherlink Explorer",
+      url: "https://explorer.etherlink.com/",
+    },
+  ],
+  id: 42793,
+  name: "Etherlink",
+  nativeCurrency: {
+    decimals: 18,
+    name: "Etherlink",
+    symbol: "XTZ",
+  },
+});

packages/thirdweb/src/exports/chains.ts

@@ -30,6 +30,8 @@ export { cronos } from "../chains/chain-definitions/cronos.js";
 export { degen } from "../chains/chain-definitions/degen.js";
 // mainnet = alias for ethereum
 export { ethereum, mainnet } from "../chains/chain-definitions/ethereum.js";
+export { etherlink } from "../chains/chain-definitions/etherlink.js";
+export { etherlinkTestnet } from "../chains/chain-definitions/etherlink-testnet.js";
 export { fantom } from "../chains/chain-definitions/fantom.js";
 export { fantomTestnet } from "../chains/chain-definitions/fantom-testnet.js";
 export { frameTestnet } from "../chains/chain-definitions/frame-testnet.js";