Implement Sites API

BaseKit api documentation: https://apidocs.basekit.com/api-reference/sites/

### Endpoints
- [ ] get sites
- [ ] get site
- [ ] edit site
- [ ] delete site
- [ ] hard delete site
- [ ] publish site
- [ ] reset site

### Tests:
- [ ] Add tests for all the added domain objects
- [ ] Add tests for all the added endpoints