GREG-25: Adding namespace versioning

Adding namespace-versioning to API.

The swagger interface has been checked and it still works.

It is now possible to look at at a variable in the request (request.version) to inspect the namespace used.

greg/api/urls.py

 from django.urls import (
-    path,
     re_path,
 )
 from rest_framework.routers import DefaultRouter
-from drf_spectacular.views import (
-    SpectacularAPIView,
-    SpectacularSwaggerView,
-)
 
 from greg.api.views.consent import ConsentViewSet
 from greg.api.views.organizational_unit import OrganizationalUnitViewSet
@@ -16,7 +11,6 @@ from greg.api.views.person import (
     PersonIdentityViewSet,
 )
 from greg.api.views.role import RoleViewSet
-from greg.api.views.health import Health
 from greg.api.views.sponsor import SponsorViewSet, SponsorGuestsViewSet
 
 router = DefaultRouter()
@@ -30,13 +24,6 @@ router.register(r"orgunit", OrganizationalUnitViewSet, basename="orgunit")
 urlpatterns = router.urls
 
 urlpatterns += [
-    path("schema/", SpectacularAPIView.as_view(), name="schema"),
-    path(
-        "schema/swagger-ui/",
-        SpectacularSwaggerView.as_view(url_name="schema"),
-        name="swagger-ui",
-    ),
-    path("health/", Health.as_view()),
     re_path(
         r"^persons/(?P<person_id>[0-9]+)/roles/$",
         PersonRoleViewSet.as_view({"get": "list", "post": "create"}),