[ACA-3266] Improve version upload component (#5766)

* added new component to compare current and new file version of a node.

* update doc

* added more tests

* updated docs

* small fixes

* changed with typography

* Update version-comparison.component.md

* handle hiding the comparison component on demo shell if cancelled/uploaded a new file version

* small fixes

* added export the new component version-comparison

Co-authored-by: Eugenio Romano <eromano@users.noreply.github.com>

lib/content-services/src/lib/version-manager/public-api.ts

@@ -18,5 +18,6 @@
 export * from './version-list.component';
 export * from './version-manager.component';
 export * from './version-upload.component';
+export * from './version-comparison.component';
 
 export * from './version-manager.module';