feat: add ElasticSettings class for Elasticsearch configuration

Author: dagweg

Source/Ecommerce.Infrastructure/Services/Providers/Search/Elastic/ElasticSettings.cs

@@ -0,0 +1,7 @@
+namespace Ecommerce.Infrastructure.Services.Providers.Search.Elastic;
+
+public class ElasticSettings
+{
+  public const string SectionName = "ElasticSettings";
+  public string ConnectionString = null!;
+}