Feature request: knit_pause()

[mine-cetinkaya-rundel]

I know about and regularly use knit_exit(). And I often find myself wanting a feature like knit_pause() to pause knitting between given spots in the document (especially when running xaringan::inf_mr() on a long presentation with lots of R code.

One option is to use HTML comment fences around such text, but I'd love a knitr R based solution that would work regardless of the output format.

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