Merged PR 4483: Adding targets (to be revised). Allows multi-year last-date computation

# Description

Changes:
* Adds template for targets -> These need to be revised
* Adds comparison of values vs. targets
* Allows for multi-year last date computation (allowing multiple years to be selected, not just the last one)

# 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.
- [X] 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: #27609, #27805

seeds/schema.yml

@@ -319,3 +319,57 @@ seeds:
                 - 214-Basic Damage Deposit
                 - 215-Resolution Process for Deposit Management Services
                 - 511-Damage Host-Waiver Payments
+
+  - name: stg_seed__main_metrics_targets
+    description: |
+      A list of financial year targets for the main metrics that we track in the company.
+    data_tests:
+      - dbt_utils.unique_combination_of_columns:
+          combination_of_columns:
+            - id_metric
+            - target_date
+
+    columns:
+      - name: id_metric
+        data_type: bigint
+        description: The id of the metric used for joining with other tables.
+        data_tests:
+          - not_null
+
+      - name: metric_name
+        data_type: character varying
+        description: The name of the metric for human consumption
+        data_tests:
+          - not_null
+
+      - name: target_date
+        data_type: date
+        description: |
+          The date when this target is expected to be achieved.
+        data_tests:
+          - not_null
+
+      - name: target_eom_value
+        data_type: numeric
+        description: |
+          The EOM target value for this metric. This is the value that we aim to 
+          achieve by the end of the month.
+        data_tests:
+          - not_null
+
+      - name: target_ytd_value
+        data_type: numeric
+        description: |
+          The YTD target value for this metric. This is the cummulative value that we
+          aim to achieve by the end of each month with respect to the beginning of the 
+          financial year, that will put us to reach the EOFY target.
+        data_tests:
+          - not_null
+
+      - name: target_eofy_value
+        data_type: numeric
+        description: |
+          The EOFY target value for this metric. This is the value that we aim to 
+          achieve by the end of the financial year.
+        data_tests:
+          - not_null