term: allow multi-line bracketed paste to not create single line with verbatim LFs

[ldemailly]

Treat "\n" (LF) like "Enter" (CR)

Avoids that when pasting 3 lines
(with a terminal like kitty, ghostty, alacritty that do not change the clipboard
in bracketed paste mode)
it turns into 1 prompt looking like:

Test> line one
..............line.two
......................line.three

Fixes golang/go#74600

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Laurent Demailly:

Patch Set 3:

(2 comments)

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