feat: enable customizable authorization checks via method-level service invocation

Introduced an extension point to allow consumers to implement their own authorization logic while preserving existing framework-level checks. This change enables method-level authorization to be overridden or extended through DI-friendly services, addressing the limitation caused by non-virtual methods and providing a clean, maintainable customization path.

framework/src/Volo.Abp.Authorization/Volo/Abp/Authorization/MethodInvocationAuthorizationService.cs

@@ -20,7 +20,7 @@ public class MethodInvocationAuthorizationService : IMethodInvocationAuthorizati
         _abpAuthorizationService = abpAuthorizationService;
     }
 
-    public async Task CheckAsync(MethodInvocationAuthorizationContext context)
+    public virtual async Task CheckAsync(MethodInvocationAuthorizationContext context)
     {
         if (AllowAnonymous(context))
         {