✨ Add Emelia nodes (#1455)

* Emelia node added

* Minor improvements on Emelia nodes

* Fix nodes and credentials listing

* Fix multi-line imports

* Apply cosmetic changes to node description

* Apply cosmetic changes to node execute method

* Fix linting details

* Apply cosmetic changes to trigger node

* Replace PNG with SVG icon

* Bring generic functions in line with codebase

* Refactor resources and add operations

* Fix typo in GraphQL call function

* Add campaign description

* Add contact list description

* ⚡ Improvements

* ⚡ Minor improvements to Emelia Nodes

Co-authored-by: Charles LECALIER <clecalie@student.42.fr>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

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

@@ -0,0 +1,18 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+export class EmeliaApi implements ICredentialType {
+	name = 'emeliaApi';
+	displayName = 'Emelia API';
+	documentationUrl = 'emelia';
+	properties = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+		},
+	];
+}