TMSS-266: Add (task) type to the TaskTemplate model with observation type as default

SAS/TMSS/src/tmss/tmssapp/migrations/0001_initial.py

SAS/TMSS/src/tmss/tmssapp/models/specification.py

SAS/TMSS/src/tmss/tmssapp/populate.py

SAS/TMSS/src/tmss/tmssapp/serializers/specification.py

SAS/TMSS/src/tmss/tmssapp/viewsets/specification.py

SAS/TMSS/src/tmss/urls.py

SAS/TMSS/test/t_tmssapp_specification_REST_API.py

SAS/TMSS/test/tmss_test_data_django_models.py

SAS/TMSS/test/tmss_test_data_rest.py