fix collection type definition: `_id` field should be optional on inserts

I basically copied the example on the docs and am getting the error in the title.

code:

```ts
import {
MongoClient,
ObjectId,
} from "https://deno.land/x/atlas_sdk@v1.0.3/mod.ts";
import { config } from "https://deno.land/x/dotenv@v3.2.0/mod.ts";

const client = new MongoClient({
endpoint: `https://data.mongodb-api.com/app/${
config().DB_APP_ID
}/endpoint/data/v1`,
dataSource: config().DB_DATA_SOURCE,
auth: {
apiKey: config().DB_API_KEY,
},
});

interface Users {
_id: ObjectId;
name: string;
email: string;
}

const db = client.database(config().DB_NAME);
const users = db.collection("users");

// error is here
users.insertOne({ // <---
name: "John Doe",
email: "johndoe@gmail.com",
});
```

error:

```
Argument of type '{ name: string; email: string; }' is not assignable to parameter of type 'Users'.
Property '_id' is missing in type '{ name: string; email: string; }' but required in type 'Users'.deno-ts(2345)
```

### Update:

This was proposed by Github Copilot and seems to work:

```ts
users.insertOne({
name: "John Doe",
email: "johndoe@gmail.com",
_id: new ObjectId(),
});
```

### Update:
Works:


Trace the collection generic and insertOne type definition used by the TypeScript SDK, starting from the failing call shown in the issue. Make the _id field optional for inserts while preserving generated or supplied IDs, then verify that the documented example type-checks without requiring _id.

Written by the indexing model from the issue text.