Implement a `datetime` type for site settings and object site settings
You can implement this type as so:
```
test_setting:
default: ""
client: true
type: "datetime"
```
- Add necessary validations
- Add tests
### Preview
<img width="670" height="264" alt="Screenshot 2025-12-29 at 11 59 13 AM"
src="https://github.com/user-attachments/assets/48d330e3-a38c-4d6a-9ea7-c4271b3e360e"
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