Model Definition: Bulk configuration using Fluent API

[AndriySvyryd]

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    foreach (var entityType in modelBuilder.Entities())
    {
        entityType.HasKey("Id");
    }
    foreach (var ownedEntityType in modelBuilder.OwnedEntities())
    {
        ownedEntityType.HasForeignKey("Id");
    }
}

Related to #6787 and #15258