repl: improve repl autocompletion for require calls

This improves the autocompletion for require calls. It had multiple
small issues so far. Most important: it won't suggest completions for
require statements that are fully written out. Second, it'll detect
require calls that have whitespace behind the opening bracket. Third,
it makes sure node modules are detected as such instead of only
suggesting them as folders. Last, it adds suggestions for input that
starts with backticks.

Signed-off-by: Ruben Bridgewater <ruben@bridgewater.de>

PR-URL: https://github.com/nodejs/node/pull/33282
Fixes: https://github.com/nodejs/node/issues/33238


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>