✨ Add Google Slides node (#1599)

* ✨ Add Google Slides node

* 🔨 Minor fixes

* 🔨 Refactor Google Slides node

* ⚡ Improvements

* ⚡ Add download option and fix multi items on Google Slides

Co-authored-by: Tanay Pant <tanaypant@protonmail.com>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

packages/nodes-base/credentials/GoogleSlidesOAuth2Api.credentials.ts

@@ -0,0 +1,26 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+const scopes = [
+	'https://www.googleapis.com/auth/drive.file',
+	'https://www.googleapis.com/auth/presentations',
+];
+
+export class GoogleSlidesOAuth2Api implements ICredentialType {
+	name = 'googleSlidesOAuth2Api';
+	extends = [
+		'googleOAuth2Api',
+	];
+	displayName = 'Google Slides OAuth2 API';
+	documentationUrl = 'google';
+	properties = [
+		{
+			displayName: 'Scope',
+			name: 'scope',
+			type: 'hidden' as NodePropertyTypes,
+			default: scopes.join(' '),
+		},
+	];
+}