[API] Adiciona o modelo de TeamSubscriptionRule e SoloSubscriptionRule

Api/components/schemas/Subscription.yaml

+SoloSubscriptionRule:
+  $ref: '#/SubscriptionRule'
+TeamSubscriptionRule:
+  allOf:
+    - $ref: '#/SubscriptionRule'
+    - type: object
+      properties:
+        minMembers:
+          type: integer
+        maxMembers:
+          type: integer
 SubscriptionRule:
   required:
     - type
     - status
   properties:
     type:
-      description: '{SOLO, TEAM}'
-      type: integer
+      type: string
+      enum:
+        - SOLO
+        - TEAM
     status:
-      description: '{PREP, OPEN, CLOSED}'
-      type: integer
+      type: string
+      enum:
+        - PREP
+        - OPEN
+        - CLOSED
     oid:
       type: integer
-    minMembers:
-      type: integer
-    maxMembers:
-      type: integer
+  discriminator:
+    propertyName: type
+    mapping:
+      - SOLO: '#/SoloSubscriptionRule'
+      - TEAM: '#/TeamSubscriptionRule'
 Subscription:
   required:
     - status