Issue #3 - Import openapi spec, fix tests + generation

spec/openapi.yaml

+openapi: '3.1.0'
+info:
+   version: 1.0.0
+   title: Working Groups API
+   description: Access information on Eclipse Foundation Working Groups.
+   license:
+      name: Eclipse Public License - 2.0
+      url: https://www.eclipse.org/legal/epl-2.0/
+servers:
+-  url: https://membership.eclipse.org/api
+   description: Production endpoint for the membership portal data
+paths:
+   /working_groups:
+      get:
+         tags:
+         - Working Groups
+         summary: Working Group List
+         description: Returns a working group entry that has a matching ID 
+         responses:
+            200:
+               description: Success
+               content:
+                  application/json:
+                     schema:
+                        $ref: '#/components/schemas/WorkingGroups'
+            500:
+               description: Error while retrieving data
+   /working_groups/{alias}:
+      parameters:
+      -  name: alias
+         in: path
+         description: The name of the working group to retrieve
+         required: true
+         schema:
+            type: string
+      get:
+         summary: Working Group
+         description: Returns a working group entry that has a matching alias
+         responses:
+            200:
+               description: Success
+               content:
+                  application/json:
+                     schema:
+                        $ref: '#/components/schemas/WorkingGroup'
+            500:
+               description: Error while retrieving data
+components:
+   securitySchemes:
+      openId:
+         type: openIdConnect
+         openIdConnectUrl: https://auth.eclipse.org/auth/realms/foundation/.well-known/openid-configuration
+   schemas:
+      ObjectID:
+         description: Unique identifier for an addressable object in the API. Can be null when posting or updating objects in the API if part of the root element or is a new entity. Should always be set in responses.
+         type: 
+            - string
+            - 'null'
+         minimum: 1
+      WorkingGroups:
+         type: array
+         items:
+            $ref: '#/components/schemas/WorkingGroup'
+      WorkingGroup:
+         type: object
+         properties:
+            alias:
+               type: string
+               description: internal alias for the working group 
+            title:
+               type: string
+               description: Public-facing or official name of the working group
+            status:
+               type: string
+               description: Current status of the working group (e.g. incubating, active, archived)
+            logo:
+               type: string
+               description: image link for the working groups logo
+            description:
+               type: string
+               description: Short description of the working group
+            resources:
+               $ref: '#/components/schemas/WorkingGroupResources'
+            levels:
+               $ref: '#/components/schemas/WorkingGroupLevels'
+      WorkingGroupResources:
+        type: object
+        properties:
+          charter:
+             type: string
+             description: Link to the charter for the current working group
+          contact_form:
+             type: string
+             description: URL link to the contact form
+          members:
+             type: string
+             description: URL to the members list for the given working group
+          participation_agreements:
+             type: object
+             properties:
+                individual:
+                   $ref: '#/components/schemas/WorkingGroupParticipationAgreement'
+                organization:
+                   $ref: '#/components/schemas/WorkingGroupParticipationAgreement'
+          sponsorship:
+             type: string
+             description: link to the sponsorship agreement document
+          website:
+             type: string
+             description: the URL for the homepage of this working group
+      WorkingGroupParticipationAgreement:
+         type: object
+         properties:
+            document_id:
+               $ref: '#/components/schemas/ObjectID'
+            pdf:
+               type: string
+               description: Link to the PDF version of the participation agreement
+      WorkingGroupLevels:
+         type: array
+         items:
+          $ref: '#/components/schemas/WorkingGroupLevel'
+      WorkingGroupLevel:
+         type: object
+         description: Definition of the participation level for the working group, including its relation code
+         properties:
+           relation:
+              type: string
+              description: code representing the relation, used internally when using common relation types
+           description:
+              type: string
+              description: the label for the participation level