`pop_opt`, `peek`, `peek_opt` functions for `queue`#92

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lyrm merged 2 commits intoocaml-multicore:mainfrom lyrm:more_functions

Nov 5, 2023

+850-170

Commits on Oct 17, 2023

Add peek, peek_opt, pop and try_push to queues and stack with necessary tests.
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Commits on Nov 3, 2023

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