Allow specifying different foreign key facets per table in TPT, TPC or entity splitting

[AndriySvyryd]

Split off from #19811

modelBuilder.Entity<Customer>().ToTable("Customer");
modelBuilder.Entity<SpecialCustomer>().ToTable("SpecialCustomer", tb =>
{
    tb.HasForeignKey<Customer>(c => c.Id)
      .IsRequired(false)
      .HasConstraintName("FK_CustomerDetails_Customer");
});

Alternative API:

modelBuilder.Entity<Customer>().HasOne<Customer>().WithOne()
    .HasForeignKey<Customer>(c => c.Id)
    .IsRequired(false)
    .ToTables("CustomerDetails", "Customer", tb => tb.HasConstraintName("FK_CustomerDetails_Customer"));