[FEATURE]: Support date mode for time types for introspection

### Describe what you want

When generating schema file with introspection, default [mode](https://orm.drizzle.team/docs/column-types/pg#timestamp) for time-related types is string:
```
timestamp('created_at', { mode: 'string' })
```

It would be great to support passing default mode via drizzle-kit CLI or drizzle config option. Example:
```
{
introspect: {
timeMode: 'date'
}
}
```