Add configurations and update packages

GerstITS.Examples.Api/Common/Configurations/WebApiConfiguration.Server.Headers.cs

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+using GerstITS.System.Configurations;
+using GerstITS.Web.Api.Builder;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.HttpOverrides;
+
+namespace GerstITS.Examples.Api.Configurations
+{
+    internal sealed class WebApiHeadersConfiguration : IHeaderConfiguration, IConfiguration
+    {
+        #region Constructors
+
+        public WebApiHeadersConfiguration(string parentPrefix, Microsoft.Extensions.Configuration.IConfiguration configuration)
+        {
+            var prefix = $"{parentPrefix}:{this.ToConfigurationPrefix()}";
+
+            ForwardedHeaders = new ForwardedHeadersOptions
+            {
+                ForwardedHeaders = configuration.GetFlaggedEnum<ForwardedHeaders>($"{prefix}:{nameof(ForwardedHeadersOptions)}:{nameof(ForwardedHeadersOptions.ForwardedHeaders)}")
+            };
+        }
+
+        #endregion
+
+        #region IHeaderConfiguration
+
+        public ForwardedHeadersOptions ForwardedHeaders { get; }
+
+        #endregion
+    }
+}