Add `Picos_std_sync.Queue` #4360

Job	Run time
build-on-lower-bound (ubuntu-latest, 4.12.x)	1m 49s
test-on-windows (ocaml.5.0.0,ocaml-option-mingw)	11m 52s
test-on-windows (ocaml.5.1.1,ocaml-option-mingw)	11m 39s
test-on-windows (ocaml.5.2.0,ocaml-option-mingw)	12m 7s
	37m 27s

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