[FEATURE]: return a object instead of a array if insert value is a object not array

### Describe what you want

Hi, I want to create a row, so I code this.

```ts
const model = await this.db.drizzle
.insert(schema.user)
.values({
authCode,
...userDto,
password: hashSync(userDto.password, 10),
})
.returning()

return model[0]
```

I added a `.returning` to get the new model. But I got `model[]`, to I should destruct it first. `model[0]` is the data I want. But I insert just a single object, so the expected result should be an object, which can save one step of writing.

This is the expected behaviour.

```ts
const model = await this.db.drizzle
.insert(schema.user)
.values({
authCode,
...userDto,
password: hashSync(userDto.password, 10),
})
.returning()

return model
```