Merged PR 3431: Adds Invoicing metrics

# Description

Same old story: includes all metrics coming from Xero.
Adds a daily model, monthly, mtd + monthly agg and mtd agg
A test to compare values new vs. old
AND fixes the issue I mentioned with the timestamp - an issue in the old KPIs.

# Checklist

- [X] The edited models and dependants run properly with production data.
- [X] The edited models are sufficiently documented.
- [X] The edited models contain PK tests, and I've ran and passed them.
- [NA] I have checked for DRY opportunities with other models and docs.
- [X] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

Related work items: #23565

models/intermediate/kpis/int_kpis__metric_monthly_invoiced_revenue.sql

@@ -0,0 +1,37 @@
+{{
+    config(
+        materialized="view",
+        unique_key=[
+            "end_date",
+            "id_deal",
+            "active_accommodations_per_deal_segmentation",
+        ],
+    )
+}}
+
+select
+    -- Unique Key --
+    d.first_day_month as start_date,
+    d.date as end_date,
+    ir.id_deal,
+    ir.active_accommodations_per_deal_segmentation,
+    -- Dimensions --
+    ir.main_billing_country_iso_3_per_deal,
+    -- Metrics --
+    sum(ir.xero_booking_net_fees_in_gbp) as xero_booking_net_fees_in_gbp,
+    sum(ir.xero_listing_net_fees_in_gbp) as xero_listing_net_fees_in_gbp,
+    sum(ir.xero_verification_net_fees_in_gbp) as xero_verification_net_fees_in_gbp,
+    sum(ir.xero_operator_net_fees_in_gbp) as xero_operator_net_fees_in_gbp,
+    sum(
+        ir.xero_waiver_paid_back_to_host_in_gbp
+    ) as xero_waiver_paid_back_to_host_in_gbp,
+    sum(ir.xero_e_deposit_net_fees_in_gbp) as xero_e_deposit_net_fees_in_gbp,
+    sum(ir.xero_guesty_net_fees_in_gbp) as xero_guesty_net_fees_in_gbp,
+    sum(ir.xero_apis_net_fees_in_gbp) as xero_apis_net_fees_in_gbp
+
+from {{ ref("int_kpis__dimension_dates") }} d
+left join
+    {{ ref("int_kpis__metric_daily_invoiced_revenue") }} ir
+    on date_trunc('month', ir.date)::date = d.first_day_month
+where d.is_end_of_month = true and ir.id_deal is not null
+group by 1, 2, 3, 4, 5