[task] Split the existing single dateTime range into separate date and time fields

Enhance the `getFreeTimeSlots` and `getEvents` actions for both **Google Calendar** and **Microsoft Outlook** integrations to support separate date and time inputs.

Replace the single dateTime range with date range (required) and time fields (optional, per boundary)
Time inputs are now displayed only when the corresponding date is provided and defaulted automatically (`fromTime` - start of day, `toTime` - end of day)

**Benefits**

- Improves clarity by separating date and time concerns

- Reduces friction by removing the need to always specify timestamps

- Provides` greater flexibility for common use cases (e.g., full-day queries)

- [x] Google Calendar
- [ ] Microsot Outlook