[ACA-3266] Improve version upload component (#5750)

* 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

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

lib/content-services/src/lib/version-manager/version-comparison.component.ts

@@ -0,0 +1,40 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Component, Input } from '@angular/core';
+import { Node } from '@alfresco/js-api';
+import { ThumbnailService } from '@alfresco/adf-core';
+
+@Component({
+    selector: 'adf-version-comparison',
+    templateUrl: './version-comparison.component.html',
+    styleUrls: ['./version-comparison.component.scss']
+})
+export class VersionComparisonComponent {
+
+    /** Target node. */
+    @Input()
+    node: Node;
+
+    /** New file for updating current version. */
+    @Input()
+    newFileVersion: File;
+
+    constructor(public thumbnailService: ThumbnailService) {
+    }
+
+}