Add a per-day "attribution-settled" flag and a guaranteed "matches Ads Manager" purchase-value field to the Meta connector#1787

Meta data already extracts correctly — spend matches billed spend, and action_values_omni_purchase matches Ads Manager when we set use_unified_attribution_setting=true.
Two enhancements would let us automate confidently: (a) a per-row data-freshness / “settled” indicator — a boolean or “last updated” timestamp per date showing whether that day’s attributed conversions are final or still inside the attribution window and likely to revise — so our automation can mark recent days “provisional” and trigger a re-pull instead of locking unsettled numbers; and (b) a documented field (or default) that always returns the account/ad-set’s own configured attribution without us passing options, so the conversion value provably equals what the client sees in Ads Manager for that date.
Also please confirm in the field docs that spend is the final billed amount in the account’s currency and timezone.