Move query result classes to QueryOutput namespace

BodyQueryResult and HeaderQueryResult were relocated from ReC.Domain.Entities to ReC.Domain.QueryOutput. Updated all references in IRecDbContext and RecDbContext to use the new namespace.

src/ReC.Infrastructure/RecDbContext.cs

@@ -1,6 +1,7 @@
 using Microsoft.EntityFrameworkCore;
 using ReC.Application.Common.Interfaces;
 using ReC.Domain.Entities;
+using ReC.Domain.QueryOutput;
 using ReC.Domain.Views;
 
 namespace ReC.Infrastructure;