[utils] Add utility to wait for a designated amount of time

It's fairly common in many of our projects to have some kind of helper that looks like this:

``` typescript
async function waitFor(duration: number): Promise {
return new Promise((resolve) => setTimeout(resolve, duration));
}
```

See:

- https://github.com/MetaMask/test-dapp/blob/0ea6cc7a496eb0049c735b4deffcc0ba9b234281/src/index.js#L624
- https://github.com/MetaMask/metamask-sdk/blob/55c1dd327affdef9dd6c308898d1f6b808a1ad8f/packages/sdk/src/utils/wait.ts#L1
- https://github.com/MetaMask/metamask-extension/blob/0e5c05ad3b68f80712b976583e4092551bc4aaee/development/lib/retry.js#L34
- https://github.com/MetaMask/metamask-desktop/blob/92fb331eea05004b03d810ba474dcd3e4d9f7fb1/packages/app/src/app/utils/sleep.ts#L1
- https://github.com/MetaMask/eth-json-rpc-infura/blob/dc19a35091a436f8c654514a40deac047866f9f5/src/create-infura-middleware.ts#L248C1-L248C1

We should add that here too.

Start by reviewing the wait implementations linked in test-dapp/src/index.js, metamask-sdk/packages/sdk/src/utils/wait.ts, metamask-extension/development/lib/retry.js, metamask-desktop/packages/app/src/app/utils/sleep.ts, and eth-json-rpc-infura/src/create-infura-middleware.ts. Then locate the appropriate shared utility package in this monorepo, add the reusable wait helper there, and run that package's tests and checks to confirm it is available and passes.

Written by the indexing model from the issue text.