Display spinner when image is loading (result)

...nce/search/components/result/image-display.component.html

.../search/components/result/image-display.component.spec.ts

...tance/search/components/result/image-display.component.ts

...search/components/result/image-list-result.component.html

...rch/components/result/image-list-result.component.spec.ts

...e/search/components/result/image-list-result.component.ts

client/src/app/instance/search/components/result/index.ts

.../src/app/instance/search/containers/result.component.html

...c/app/instance/search/containers/result.component.spec.ts