[ACA-4676][ACA-4678] Added Non Responsive Preview Dialog to viewer component (#8428)

* [ACA-4676] Added NonResponsivePreview dialog to download file incase file preview takes longer than a set period of time.

* [ACA-4676] Updated button positioning for non responsive preview dialog

* [ACA-4676] Added documentation for NonResponsivePreviewDialog functionality for viewer.component.ts

* [ACA-4676] Added unit tests for NonResponsivePreviewDialog

* [ACA-4676] Updated template of NonResponsivePreviewDialog to use components and directives from mat-dialog. Removed non-responsive-dialog.component.scss. Removed unused methods from non-responsive-dialog.component.ts

* [ACA-4676] Corrected typo in NonResponsivePreviewDialog unit tests

* [ACA-4676] Added test cases for NonResponsivePreviewDialog in viewer.component.ts. NOT WORKING

* [ACA-4676] Fixed test cases for non-responsive preview dialog. Moved NonResponsivePreview dialog tests to separate describe block. Updated component code to make properties and methods visible to testing environment

* [ACA-4676] Migrated viewer component test env setup from setupTestBed() to TestBed.configureTestingModule(). Moved NonResponsivePreviewDialog unit tests to inside parent Viewer component describe block

* [ACA-4676] Removed unused async tag. Added license info to non-responsive-dialog.component.ts and non-responsive-preview-actions.enum.ts

* [ACA-4676] Updated code to use "viewer" appConfig object instead of "preview-config". Added non-responsive-preview-actions.enum.ts to public-api.ts

* [ACA-4676] Resolved potential lint issues

* [ACA-4676] Updated non responsive preview to look for viewer config object inside app.config instead of preview-config

* [ACA-4676] Removed duplicate import for @adf/core. Added NonResponsiveDialogComponent to adf/core exports

* [ACA-4676] Renamed properties/config/documentation from nonResponsivePreview to downloadPrompt. Renamed NonResponsivePreviewActionsEnum to DownloadPromptActions.

* [ACA-4676] Resolved linting and unit test failures

* [ACA-4676] Changed dataType for timers to number. Updated code to use window.setTimeout(), instead of just setTimeout(). Added missing whitespace. Updated method names in demo shell to use 'downloadPrompt' naming scheme.

* [ACA-4676] Fixed incorrect import statement in viewer.module.ts for download-prompt-dialog

* [ACA-4676] Testing disabled by default behaviour of downloadPrompt feature

* [ACA-4676] Changed default value for enableDownloadPrompt and enableDownloadPromptReminders to false in app.config.json

* [ACA-4676] Removed un-needed AppConfig configurations from unit tests

demo-shell/src/app.config.json

@@ -1478,6 +1478,10 @@
     ]
   },
   "viewer": {
+    "enableDownloadPrompt":  false,
+    "enableDownloadPromptReminder": false,
+    "downloadPromptDelay": 50,
+    "downloadPromptReminderDelay": 30,
     "enableFileAutoDownload": true,
     "fileAutoDownloadSizeThresholdInMB": 15
   }