Customizable subprompt in `node:repl` module

[edemaine]

What is the problem this feature will solve?

#57400 changed the node:repl module's "subprompt" from ... to |. This is arguably good for Node's REPL where the main prompt is one character (>), so it encourages alignment, but bad for other software that relied on the subprompt being 3 characters long. See e.g. DanielXMoore/Civet#1768

What is the feature you are proposing to solve the problem?

I suggest that subprompt can be specified in the options object to node:repl, which lets the subprompt be configured. The default remains "| ".

This will require changing the structure of node:readline (where this subprompt is currently stored), though I'm not sure whether we need a public API there.

What alternatives have you considered?

FWIW, #57400 that changed from ... to | mentioned TODO(puskin94): make this configurable (though the comment has since been removed).

I also tried manually overriding require('node:repl').Interface.prototype.setPrompt and require('node:repl').Interface.prototype.prompt, but this did not seem to work; perhaps a different copy of Interface is getting used by node:repl.

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