Test: suggestions in debug repl

[isidorn]

test for #8114:
complexity: 3

• any OS - @alexandrudima
• any OS - @stevencl

As per feature request #8114, debug repl now supports suggestions. Start a node debug session and verify:

• When typing in the debug repl input you get inteli-sense suggestions which make sense
• Upon accepting a suggestion the text in the repl input is properly replaced
• Be creative and use the multi line repl input to try to break the suggestions