feat(ServiceNow Node): Add attachment functionality (#3137)

* ✨ Add ServiceNow attachment functionality

* 🔨 download fix

* ⚡ improvements

* ⚡ parameter name fix

* ⚡ download attachment for get all operation

* ⚡ filters update

* ⚡ hint update

* ⚡ Small improvements

Co-authored-by: Michael Kret <michael.k@radency.com>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>

packages/nodes-base/nodes/ServiceNow/GenericFunctions.ts

@@ -82,9 +82,34 @@ export async function serviceNowRequestAllItems(this: IExecuteFunctions | ILoadO
 	return returnData;
 }
 
+export async function serviceNowDownloadAttachment(
+		this: IExecuteFunctions,
+		endpoint: string,
+		fileName: string,
+		contentType: string,
+	) {
+	const fileData = await serviceNowApiRequest.call(
+		this,
+		'GET',
+		`${endpoint}/file`,
+		{},
+		{},
+		'',
+		{ json: false, encoding: null, resolveWithFullResponse: true },
+	);
+	const binaryData = await this.helpers.prepareBinaryData(
+		Buffer.from(fileData.body as string),
+		fileName,
+		contentType,
+	);
+
+	return binaryData;
+}
+
 
 export const mapEndpoint = (resource: string, operation: string) => {
 	const resourceEndpoint = new Map([
+		['attachment', 'sys_dictionary'],
 		['tableRecord', 'sys_dictionary'],
 		['businessService', 'cmdb_ci_service'],
 		['configurationItems', 'cmdb_ci'],