Merge branch 'OZG-6988-admin-new-statistic-fields' into 'main'

alfa-client/apps/admin/src/app/app.routes.ts

...ields-form-page/statistik-fields-form-page.component.html

...ds-form-page/statistik-fields-form-page.component.spec.ts

...-fields-form-page/statistik-fields-form-page.component.ts

...ages/statistik/statistik-page/statistik-page.component.ts

...nt/libs/admin/postfach-shared/src/lib/postfach.service.ts

alfa-client/libs/admin/shared/src/lib/routes.ts

...ib/statistik-container/statistik-container.component.html

...statistik-container/statistik-container.component.spec.ts

.../lib/statistik-container/statistik-container.component.ts

...ik-fields-form/admin-statistik-fields-form.component.html

...fields-form/admin-statistik-fields-form.component.spec.ts

...stik-fields-form/admin-statistik-fields-form.component.ts

...lib/statistik-fields-form/statistik-fields.formservice.ts

alfa-client/libs/design-system/src/index.ts

...ystem/src/lib/icons/plus-icon/plus-icon.component.spec.ts

...ign-system/src/lib/icons/plus-icon/plus-icon.component.ts

...esign-system/src/lib/icons/plus-icon/plus-icon.stories.ts

alfa-client/tsconfig.base.json