⚡ Clickup OAuth2 support (#649)

* OAuth2 credentials, genericFunctions needed config, UI options for oauth2 support

* ⚡ Added options to decide when to to send the bearer

* Fixed "undefined property split" issue

* ⚡ Small fix

* ⚡ Improvements to ClickUp-Node

* ⚡ Improvements

Co-authored-by: Rupenieks <ru@myos,co>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Ricardo Espinoza <ricardo@n8n.io>

packages/nodes-base/credentials/ClickUpOAuth2Api.credentials.ts

@@ -0,0 +1,47 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+export class ClickUpOAuth2Api implements ICredentialType {
+	name = 'clickUpOAuth2Api';
+	extends = [
+		'oAuth2Api',
+	];
+	displayName = 'ClickUp OAuth2 API';
+	properties = [
+		{
+			displayName: 'Authorization URL',
+			name: 'authUrl',
+			type: 'hidden' as NodePropertyTypes,
+			default: 'https://app.clickup.com/api',
+			required: true,
+		},
+		{
+			displayName: 'Access Token URL',
+			name: 'accessTokenUrl',
+			type: 'hidden' as NodePropertyTypes,
+			default: 'https://api.clickup.com/api/v2/oauth/token',
+			required: true,
+		},
+		{
+			displayName: 'Scope',
+			name: 'scope',
+			type: 'hidden' as NodePropertyTypes,
+			default: '',
+		},
+		{
+			displayName: 'Auth URI Query Parameters',
+			name: 'authQueryParameters',
+			type: 'hidden' as NodePropertyTypes,
+			default: '',
+		},
+		{
+            displayName: 'Authentication',
+            name: 'authentication',
+            type: 'hidden' as NodePropertyTypes,
+            default: 'body',
+            description: 'Resource to consume.',
+        },
+	];
+}