feat(settings): Added feature toggling. (TV-564)

Squashed commit of the following:

commit b67cced3bd44d1673173e5fa188d776d2d097fd4
Author: Erik Tiekstra <erik.tiekstra@arbetsformedlingen.se>
Date:   Fri Sep 10 11:59:37 2021 +0200

    Added feature toggling for routes and navigation

apps/mina-sidor-fa/src/app/shared/enums/feature.enum.ts

@@ -0,0 +1,9 @@
+export enum Feature {
+  AVROP,
+  DELTAGARE,
+  ADMINISTRATION,
+  MY_ACCOUNT,
+  MY_ORGANIZATION,
+  RELEASES,
+  MOCK_LOGIN,
+}