Filtering path operations by tags

[Tetraquark]

Need to implement filtration path operations by tags.

For example I have this path:

  '/api/request':
    get:
      operationId: api_request_get
      description: ''
      responses:
        '200':
          description: ''
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Response'
      tags:
        - api
    delete:
      operationId: api_request_delete
      description: ''
      responses:
        '204':
          description: ''
      tags:
        - internal
        - api

And sometimes I need generate api without operations with tag internal. In this example, I don't need delete method in the api class, so I want to filter it by the internal tag

[Alex009]

duplicate of #46