[SDK] Expose stuff for UD extensions, improve test (#4962)

## Problem solved

Short description of the bug fixed or feature added

<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on enhancing the `thirdweb` SDK by exposing new functionalities related to `UnstoppableDomains`, specifically the `namehash`, `reverseNameOf`, and `exists` methods, along with related error handling and utility functions.

### Detailed summary
- Added `namehash` and `reverseNameOf` functions to `UnstoppableDomains`.
- Introduced `exists` function to check the existence of a tokenId.
- Updated `resolveAddress` to utilize `exists` for validation.
- Added error handling for non-existent domain names in tests.
- Exported new types and functions from `unstoppable-domains`.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

<!-- end pr-codex -->

Author: kien-ngo

.changeset/big-fans-reflect.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+Expose UnstoppableDomains extensions: namehash and reverseNameOf

packages/thirdweb/scripts/generate/abis/unstoppable-domains/UnstoppableDomains.json

@@ -1,5 +1,6 @@
 [
   "function reverseNameOf(address addr) view returns (string reverseUri)",
   "function getMany(string[] keys, uint256 tokenId) view returns (string[] values)",
-  "function namehash(string[] labels) pure returns (uint256 hash)"
+  "function namehash(string[] labels) pure returns (uint256 hash)",
+  "function exists(uint256 tokenId) view returns (bool)"
 ]

packages/thirdweb/src/exports/extensions/unstoppable-domains.ts

@@ -7,3 +7,12 @@ export {
   type ResolveAddressOptions,
   resolveAddress,
 } from "../../extensions/unstoppable-domains/read/resolveAddress.js";
+export {
+  // Need this to resolve the tokenId, so that Social SDK can fetch the owner's Avatar from it
+  namehash,
+  type NamehashParams,
+} from "../../extensions/unstoppable-domains/__generated__/UnstoppableDomains/read/namehash.js";
+export {
+  reverseNameOf,
+  type ReverseNameOfParams,
+} from "../../extensions/unstoppable-domains/__generated__/UnstoppableDomains/read/reverseNameOf.js";

packages/thirdweb/src/extensions/unstoppable-domains/__generated__/UnstoppableDomains/read/exists.ts

@@ -15,4 +15,15 @@ describe("Unstoppable Domain: resolve address", () => {
       ).toLowerCase(),
     ).toBe("0x12345674b599ce99958242b3D3741e7b01841DF3".toLowerCase());
   });
+
+  it("should throw an error with a non-existent domain name", async () => {
+    await expect(() =>
+      resolveAddress({
+        name: "thirdwebsdk.thissuredoesnotexist",
+        client: TEST_CLIENT,
+      }),
+    ).rejects.toThrowError(
+      "Could not resolve a valid tokenId from the domain: thirdwebsdk.thissuredoesnotexist. Make sure it exists.",
+    );
+  });
 });

packages/thirdweb/src/extensions/unstoppable-domains/read/resolveAddress.test.ts

@@ -4,6 +4,7 @@ import type { ThirdwebClient } from "../../../client/client.js";
 import { getContract } from "../../../contract/contract.js";
 import { getAddress, isAddress } from "../../../utils/address.js";
 import { withCache } from "../../../utils/promise/withCache.js";
+import { exists } from "../__generated__/UnstoppableDomains/read/exists.js";
 import { getMany } from "../__generated__/UnstoppableDomains/read/getMany.js";
 import { namehash } from "../__generated__/UnstoppableDomains/read/namehash.js";
 import { UD_POLYGON_MAINNET } from "../consts.js";
@@ -71,6 +72,14 @@ export async function resolveAddress(
         labels: name.split("."),
       });
 
+      // `namehash` always return a value, we should use `exists` to make sure it's valid
+      const _exists = await exists({ contract, tokenId: possibleTokenId });
+      if (!_exists) {
+        throw new Error(
+          `Could not resolve a valid tokenId from the domain: ${name}. Make sure it exists.`,
+        );
+      }
+
       // Resolve ETH address from the tokenId
       const resolved = await getMany({
         contract,