[API] Inclusão de rota para buscar vencedores de uma competição na API competition.

Api/Competition.API.yaml

@@ -151,6 +151,23 @@ paths:
               schema:
                 $ref: 'https://gitlab.dev.evologica.com.br/Competify/Docs/raw/master/Api/components/schemas/Competition.json#/Competition'
   
+  /competition/winners:
+    get:
+      tags:
+        - public
+      summary: Retrieves all competition winners
+      description: Retrieves all competition winners
+      responses:
+        '200':
+          description: 'Array of object json with competition winners information'
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  oneOf:
+                    - $ref: 'https://gitlab.dev.evologica.com.br/Competify/Docs/raw/master/Api/components/schemas.json#/Winner'
+
   /subscription:
     get:
       tags: