Move strict_is_not_null_in_views option from db::config to cql_config via
new view_restrictions sub-struct. This improves separation of concerns by
keeping view-specific validation policies with other CQL configuration.
Update prepare_view() to take view_restrictions reference instead of reaching
into db::config, and update all callsites to pass the sub-struct.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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