Add reflow comments in cell command

[vezwork]

Fixes #408

Kapture.2026-08-12.at.16.01.03.mp4

• Adds a command "Quarto: Reflow Comments in Cell" that breaks up long comment lines into multiple comment lines (by default 80 characters is considerered long, but that is configurable by quarto.cells.reflowColumn)

Tested lightly in both VSCode and Positron.

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