[SDK] Add tests for ethers5 Adapter (#4339)

## Problem solved

Short description of the bug fixed or feature added

<!-- start pr-codex -->

---

## PR-Codex overview
The focus of this PR is to export functions `toEthersProvider`, `toEthersContract`, and `fromEthersContract` in `ethers5.ts`, and update test cases in `ethers5.test.ts` for these functions.

### Detailed summary
- Exported `toEthersProvider`, `toEthersContract`, and `fromEthersContract` functions in `ethers5.ts`
- Updated test cases in `ethers5.test.ts` for `toEthersContract` and `fromEthersContract`
- Added imports and test cases for new functions and modules

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

<!-- end pr-codex -->

packages/thirdweb/src/adapters/ethers5.test.ts

@@ -1,11 +1,19 @@
 import * as ethers5 from "ethers5";
-import { describe, expect, test } from "vitest";
-import { ANVIL_CHAIN } from "../../test/src/chains.js";
+import { describe, expect, it, test } from "vitest";
+import { USDT_CONTRACT } from "~test/test-contracts.js";
+import { ANVIL_CHAIN, FORKED_ETHEREUM_CHAIN } from "../../test/src/chains.js";
 import { TEST_CLIENT } from "../../test/src/test-clients.js";
 import { ANVIL_PKEY_A, TEST_ACCOUNT_B } from "../../test/src/test-wallets.js";
+import { resolveContractAbi } from "../contract/actions/resolve-abi.js";
+import { decimals } from "../extensions/erc20/__generated__/IERC20/read/decimals.js";
 import { randomBytesBuffer } from "../utils/random.js";
 import { privateKeyToAccount } from "../wallets/private-key.js";
-import { toEthersSigner } from "./ethers5.js";
+import {
+  fromEthersContract,
+  toEthersContract,
+  toEthersProvider,
+  toEthersSigner,
+} from "./ethers5.js";
 
 const account = privateKeyToAccount({
   privateKey: ANVIL_PKEY_A,
@@ -110,4 +118,35 @@ describe("ethers5 adapter", () => {
     });
     expect(txResponse.hash.length).toBe(66);
   });
+
+  it("toEthersContract should work", async () => {
+    const ethersContract = await toEthersContract(ethers5, USDT_CONTRACT);
+    expect(ethersContract.address.toLowerCase()).toBe(
+      USDT_CONTRACT.address.toLowerCase(),
+    );
+    const decimals = await ethersContract.decimals();
+    expect(decimals.toString()).toBe("6");
+  });
+
+  it("fromEthersContract should work", async () => {
+    const provider = toEthersProvider(
+      ethers5,
+      TEST_CLIENT,
+      FORKED_ETHEREUM_CHAIN,
+    );
+    const ethersContract = new ethers5.Contract(
+      USDT_CONTRACT.address,
+      await resolveContractAbi(USDT_CONTRACT),
+      provider,
+    );
+
+    const thirdwebContract = await fromEthersContract({
+      client: TEST_CLIENT,
+      ethersContract,
+      chain: FORKED_ETHEREUM_CHAIN,
+    });
+
+    const _decimals = await decimals({ contract: thirdwebContract });
+    expect(_decimals).toBe(6);
+  });
 });

packages/thirdweb/src/adapters/ethers5.ts

@@ -274,7 +274,7 @@ export const ethers5Adapter = /* @__PURE__ */ (() => {
  * @returns The ethers.js provider.
  * @internal
  */
-function toEthersProvider(
+export function toEthersProvider(
   ethers: Ethers5,
   client: ThirdwebClient,
   chain: Chain,
@@ -299,7 +299,7 @@ function toEthersProvider(
  * @returns A Promise that resolves to an ethers.js Contract.
  * @internal
  */
-async function toEthersContract<abi extends Abi = []>(
+export async function toEthersContract<abi extends Abi = []>(
   ethers: Ethers5,
   twContract: ThirdwebContract<abi>,
 ): Promise<ethers5.Contract> {
@@ -336,7 +336,7 @@ type FromEthersContractOptions = {
  * @returns A promise that resolves to a ThirdwebContract instance.
  * @internal
  */
-async function fromEthersContract<abi extends Abi>(
+export async function fromEthersContract<abi extends Abi>(
   options: FromEthersContractOptions,
 ): Promise<ThirdwebContract<abi>> {
   return getContract({