Define Test strategy for `DcimManufacturers`

[chadell]

It should cover CRUD operations:

• [ ] Create object
• [ ] Read object
• [ ] Update object
• [ ] Delete object
• [ ] Create Bulk objects
• [ ] Update Bulk objects
• [ ] Delete Bulk objects

[Kircheneer]

I am evaluating the possibility of generating unit tests automatically from examples in the openapi schema:

components:
  schemas:
    Manufacturer:
      ...
      properties:
        ...
        name:
          type: string
          maxLength: 100
          example: Cisco # this would be new