CLI uses `|` instead of `...` for continuation

[edemaine]

Node seems to have recently changed the continuation prompt from ... to :. Relevant PR: nodejs/node#57400

This means our prompts are no longer vertically aligned, which makes it hard to type indentation manually. We should find a way to restore, possibly by overriding displayPrompt.

Old Node

⟫ civet -c
Civet 0.9.0 REPL.  Enter a blank line to transpile code.
🐈> a^1
...
a
🐈>

New Node

⟫ civet -c
Civet 0.10.5 REPL.  Enter a blank line to transpile code.
🐈> a^1
|
a
🐈>

[edemaine]

I spent some time trying to fix this, but sadly it seems impossible to override displayPrompt, setPrompt, or prompt. (At least, I couldn't figure it out.) We may need to wait for a Node feature to make this configurable. To this end, I opened nodejs/node#59401