✨ Add ServiceNow node (#1932)

* ✨ ServiceNow node

* Add Table Record resource & operations

* Add Incident resource & operations

* Add User resource & operations

* Add Business Service getAll operation

* Add Business Service, Department, Dictionary and Configuration Items resources

* Improvements

* Add continueOnFail

* Fix node display name

* Fix node credentials name

* Minor improvements

* Improvements

* Add load function for fields parameter

* Add load function for incident, user and table record fields

* Fix sending input function

* Enhance ServiceNow credentials

* Apply review changes & improvements

* Minor improvements

* Minor code enhancement

* Apply review changes

* ⚡ Small improvement

* Fix TableRecord update operation & add BusinessServices loading

* ⚡ Small improvement

* ⚡ Improve ServiceNow node

* ⚡ Fix one more description

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

packages/nodes-base/credentials/ServiceNowOAuth2Api.credentials.ts

@@ -0,0 +1,62 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+export class ServiceNowOAuth2Api implements ICredentialType {
+	name = 'serviceNowOAuth2Api';
+	extends = [
+		'oAuth2Api',
+	];
+	displayName = 'ServiceNow OAuth2 API';
+	documentationUrl = 'serviceNow';
+	properties = [
+		{
+			displayName: 'Subdomain',
+			name: 'subdomain',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+			placeholder: 'n8n',
+			description: 'The subdomain of your ServiceNow environment',
+			required: true,
+		},
+		{
+			displayName: 'Authorization URL',
+			name: 'authUrl',
+			type: 'hidden' as NodePropertyTypes,
+			default: '=https://{{$self["subdomain"]}}.service-now.com/oauth_auth.do',
+			required: true,
+		},
+		{
+			displayName: 'Access Token URL',
+			name: 'accessTokenUrl',
+			type: 'hidden' as NodePropertyTypes,
+			default: '=https://{{$self["subdomain"]}}.service-now.com/oauth_token.do',
+			required: true,
+		},
+		{
+			displayName: 'Scope',
+			name: 'scope',
+			type: 'hidden' as NodePropertyTypes,
+			default: 'useraccount',
+		},
+		{
+			displayName: 'Auth URI Query Parameters',
+			name: 'authQueryParameters',
+			type: 'hidden' as NodePropertyTypes,
+			default: 'response_type=code',
+		},
+		{
+			displayName: 'Auth URI Query Parameters',
+			name: 'authQueryParameters',
+			type: 'hidden' as NodePropertyTypes,
+			default: 'grant_type=authorization_code',
+		},
+		{
+			displayName: 'Authentication',
+			name: 'authentication',
+			type: 'hidden' as NodePropertyTypes,
+			default: 'header',
+		},
+	];
+}