Draft: [DRIVER-786] Validate SELECT without FROM support

[dkropachev]

Jira: https://scylladb.atlassian.net/browse/DRIVER-786
GitHub issue: #952
Parent epic: https://scylladb.atlassian.net/browse/DRIVER-782

Draft PR for validating SELECT without FROM support in this driver.

Refs #952.

Scope:

• Add or update integration tests for SELECT 1.
• Add or update integration tests for SELECT now().
• Cover prepared and non-prepared execution paths where relevant.
• Feature-detect or skip cleanly against servers that do not support SELECT without FROM.
• Document any driver-specific limitation found during implementation.

This draft currently contains an empty setup commit so work can start from a linked branch without adding placeholder source changes.

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