Add Reset Field to `getRemaining`

[CahidArda]

With this change, we update the getRemaining method like:

-  public getRemaining = async (identifier: string): Promise<number> => {
+  public getRemaining = async (identifier: string): Promise<{
+    remaining: number;
+    reset: number;
+  }> => {

We essentially update the returned object from a number to a dictionary with remaining and reset time information.

Number of commands executed doesn't change.

Addresses #111

[linear[bot]]

DX-989 Add get reset time method to ratelimit

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
ratelimit-with-vercel-kv	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 2, 2024 1:52pm

[fahreddinozcan]

Also, we can add some comments related to reset being a timestamp in the code, which would make it easier to reason

[CahidArda]

added packageManager to kv-with-vercel example package.json to resolve this issue