Feature/add auth step

Add user and app auth + delete and update methods for steps

paths/steps/delete.yml

+tags:
+  - Pathways
+summary: del Pathway
+description: delete for Step
+operationId: delStep
+x-eov-operation-handler: steps
+security: 
+  - appAuth: []
+    userAuth: []
+parameters:
+  - name: id
+    in: query
+    description: the id for the Step
+    required: false
+    schema:
+      type: integer
+responses:
+  200:
+    description: successful operation
+    content:
+      application/json:
+        schema:
+          $ref: ../../schemas/pathways/StepResponse.yml
+  404:
+    $ref: ../../responses/notFound.yml
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