Add an option to disable/enable drawing interposer cut lines

Some changes requested.  Also, it seems we should have a control to turn drawing interposer cuts on and off (say in the blocks display panel). What do you think?

_Originally posted by @vaughnbetz in https://github.com/verilog-to-routing/vtr-verilog-to-routing/pull/3299#pullrequestreview-3325493331_
            