Draft: [DRIVER-788] Validate SELECT without FROM support

[dkropachev]

Jira: https://scylladb.atlassian.net/browse/DRIVER-788
GitHub issue: #254
Parent epic: https://scylladb.atlassian.net/browse/DRIVER-782

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

Refs #254.

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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[Copilot]

Pull request overview

Adds a new integration test fixture to validate executing SELECT statements without a FROM clause (e.g., SELECT 1, SELECT now()), including both prepared and non-prepared execution paths, aligned with DRIVER-788 / issue #254.

Changes:

• Introduces SelectWithoutFromTests integration tests for SELECT 1 and SELECT now().
• Verifies result metadata (column name/type) and decoded values for both literal and function selectors.
• Adds a server-capability skip path when SELECT without FROM is rejected as invalid/syntax error.

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