config handler

global service provider with our stuff so we stop using statics everywhere
polly retry policy for httpclient

CringePlugins/Config/Spec/IConfigurationSpecProvider.cs

@@ -0,0 +1,21 @@
+using System.Reflection;
+using Json.Schema;
+using Json.Schema.Generation;
+
+namespace CringePlugins.Config.Spec;
+
+public interface IConfigurationSpecProvider
+{
+    static abstract JsonSchema Spec { get; }
+
+    static JsonSchema? FromType(Type type)
+    {
+        if (type.IsAssignableTo(typeof(IConfigurationSpecProvider)))
+        {
+            return (JsonSchema)type.GetProperty(nameof(Spec), BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly)!
+                .GetValue(null)!;
+        }
+
+        return null;
+    }
+}