add `fk_target_field_id` attribute to metabase_field for tracking FK targets.

resources/migrations/031_add_field_fk_target.yaml

+databaseChangeLog:
+  - changeSet:
+      id: 31
+      author: agilliland
+      changes:
+        - addColumn:
+            tableName: metabase_field
+            columns:
+              - column:
+                  name: fk_target_field_id
+                  type: int
+                  constraints:
+                    nullable: true
+                    deferrable: false
+                    initiallyDeferred: false

resources/migrations/liquibase.json

@@ -28,6 +28,7 @@
       {"include": {"file": "migrations/027_add_dashcardseries_table.yaml"}},
       {"include": {"file": "migrations/028_add_user_is_qbnewb.yaml"}},
       {"include": {"file": "migrations/029_add_pulse_channel_schedule_frame.yaml"}},
-      {"include": {"file": "migrations/030_add_field_visibility_type.yaml"}}
+      {"include": {"file": "migrations/030_add_field_visibility_type.yaml"}},
+      {"include": {"file": "migrations/031_add_field_fk_target.yaml"}}
   ]
 }