Allow specifying different 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.HasKey(c => c.Id).HasName("PK_Customer");
});

Alternative API:

modelBuilder.Entity<Customer>().HasKey(c => c.Id)
    .ToTable("CustomerDetails", tb => tb.HasName("PK_Customer"));