feat: External Secrets storage for credentials (#6477)

Github issue / Community forum post (link here to close automatically):

---------

Co-authored-by: Romain Minaud <romain.minaud@gmail.com>
Co-authored-by: Valya Bullions <valya@n8n.io>
Co-authored-by: Csaba Tuncsik <csaba@n8n.io>
Co-authored-by: Giulio Andreini <g.andreini@gmail.com>
Co-authored-by: Omar Ajoue <krynble@gmail.com>

packages/editor-ui/src/api/externalSecrets.ee.ts

@@ -0,0 +1,58 @@
+import type {
+	IRestApiContext,
+	ExternalSecretsProvider,
+	ExternalSecretsProviderWithProperties,
+} from '@/Interface';
+import { makeRestApiRequest } from '@/utils';
+
+export const getExternalSecrets = async (
+	context: IRestApiContext,
+): Promise<Record<string, string[]>> => {
+	return makeRestApiRequest(context, 'GET', '/external-secrets/secrets');
+};
+
+export const getExternalSecretsProviders = async (
+	context: IRestApiContext,
+): Promise<ExternalSecretsProvider[]> => {
+	return makeRestApiRequest(context, 'GET', '/external-secrets/providers');
+};
+
+export const getExternalSecretsProvider = async (
+	context: IRestApiContext,
+	id: string,
+): Promise<ExternalSecretsProviderWithProperties> => {
+	return makeRestApiRequest(context, 'GET', `/external-secrets/providers/${id}`);
+};
+
+export const testExternalSecretsProviderConnection = async (
+	context: IRestApiContext,
+	id: string,
+	data: ExternalSecretsProvider['data'],
+): Promise<{ testState: ExternalSecretsProvider['state'] }> => {
+	return makeRestApiRequest(context, 'POST', `/external-secrets/providers/${id}/test`, data);
+};
+
+export const updateProvider = async (
+	context: IRestApiContext,
+	id: string,
+	data: ExternalSecretsProvider['data'],
+): Promise<boolean> => {
+	return makeRestApiRequest(context, 'POST', `/external-secrets/providers/${id}`, data);
+};
+
+export const reloadProvider = async (
+	context: IRestApiContext,
+	id: string,
+): Promise<{ updated: boolean }> => {
+	return makeRestApiRequest(context, 'POST', `/external-secrets/providers/${id}/update`);
+};
+
+export const connectProvider = async (
+	context: IRestApiContext,
+	id: string,
+	connected: boolean,
+): Promise<boolean> => {
+	return makeRestApiRequest(context, 'POST', `/external-secrets/providers/${id}/connect`, {
+		connected,
+	});
+};