Add a stub of using the Iceberg RESTCatalog

### Task Summary

Currently texera only supports using Psql Catalog as the Iceberg catalog. Supporting RESTCatalog can bring more flexibility on where to store the result metadata.

### Priority

P2 – Medium

### Task Type

- [x] Code Implementation
- [ ] Documentation
- [ ] Refactor / Cleanup
- [ ] Testing / QA
- [ ] DevOps / Deployment