RevEng: Split Relationship Fluent API Line in OnModelCreating()

[lajones]

Currently for RevEng in OnModelCreating() we generate the fluent API configuring a relationship all on one line e.g.:

            modelBuilder.Entity<OneToOneFKToUniqueKeyDependent>(entity =>
            {
                entity.HasOne(d => d.OneToOneFKToUniqueKeyDependentFK).WithOne(p => p.OneToOneFKToUniqueKeyDependent).HasPrincipalKey<OneToOneFKToUniqueKeyPrincipal>(p => new { p.OneToOneFKToUniqueKeyPrincipalUniqueKey1, p.OneToOneFKToUniqueKeyPrincipalUniqueKey2 }).HasForeignKey<OneToOneFKToUniqueKeyDependent>(d => new { d.OneToOneFKToUniqueKeyDependentFK1, d.OneToOneFKToUniqueKeyDependentFK2 });
            }

This can get pretty long. Consider doing the following instead:

            modelBuilder.Entity<OneToOneFKToUniqueKeyDependent>(entity =>
            {
                entity.HasOne(d => d.OneToOneFKToUniqueKeyDependentFK)
                    .WithOne(p => p.OneToOneFKToUniqueKeyDependent)
                    .HasPrincipalKey<OneToOneFKToUniqueKeyPrincipal>(p => new { p.OneToOneFKToUniqueKeyPrincipalUniqueKey1, p.OneToOneFKToUniqueKeyPrincipalUniqueKey2 })
                    .HasForeignKey<OneToOneFKToUniqueKeyDependent>(d => new { d.OneToOneFKToUniqueKeyDependentFK1, d.OneToOneFKToUniqueKeyDependentFK2 });
            }

[divega]

Minor edit on the title to make it a bit stronger 😄

[lajones]

Note: HasIndex() method chain should also be considered for this - see #3579.

[lajones]

Split the relationship config lines with PR #3588.

[lajones]

Last part checked in with commit d0f53e6.