[ADF-4894] Json editor dialog (#5082)

* move download-zip to its own folder

* json dialog

* update docs

* update test

* disable e2e test

* json widget for the Form

* remove deprecated test

* fix tests, update display text name

docs/core/dialogs/edit-json.dialog.md

@@ -0,0 +1,32 @@
+---
+Title: Edit JSON Dialog
+Added: v3.5.0
+Status: Active
+Last reviewed: 2019-09-17
+---
+
+# Edit JSON Dialog
+
+Allows a user to preview or edit a JSON content in a dialog.
+
+## Basic usage
+
+```ts
+import { EditJsonDialogSettings, EditJsonDialogComponent } from '@alfresco/adf-core';
+
+const settings: EditJsonDialogSettings = {
+    title: 'Edit Json',
+    editable: true,
+    value: `{ "hello": "world" }`
+};
+
+this.dialog.open(EditJsonDialogComponent, {
+    data: settings,
+    minWidth: '50%',
+    minHeight: '50%'
+})
+.afterClosed()
+.subscribe((value: string) => {
+    // do something with the updated value
+});
+```