[Feature Request]: SNAPSHOT/CLONE usability 2. SNAPSHOT syntax

### Is there an existing issue for the same feature request?

- [x] I have checked the existing issues.

### Is your feature request related to a problem?

```Markdown
-- the following is fine
-- we can also use table { MO_TS = 1234... }
-- this is very hard to use. At least support a human read/writable
-- like table { MO_TS = '2025-10-10 12:34:56' }
-- conversion from timestamp to unix epoch should happen automatically.
--

CREATE TABLE ai_dataset_clone CLONE ai_dataset {Snapshot = 'ai_dataset_initial'};
```

### Describe the feature you'd like

See above.

### Describe implementation you've considered

_No response_

### Documentation, Adoption, Use Case, Migration Strategy

```Markdown

```

### Additional information

_No response_