Introduce append-only cookie_banner_versions table with a JSONB
snapshot of consent-relevant configuration (privacy policy URL,
consent mode, expiry, categories and their cookies). Each version
has its own state (DRAFT/PUBLISHED) separate from the banner
lifecycle.
Replace the banner state enum (DRAFT/PUBLISHED/DISABLED) with a
simpler ACTIVE/INACTIVE toggle. Link consent records to the
specific published version the visitor accepted.
Signed-off-by: Émile Ré <emile@getprobo.com>
