Add spell checking job in the CI #1363

Job	Run time
build (--test-libcore)	48s
build (--std-tests)	51s
build (--mini-tests)	48s
build (--test-successful-rustc --nb-parts 2 --current-part 0)	47s
build (--test-successful-rustc --nb-parts 2 --current-part 1)	52s
success_gcc12	3s
	4m 9s

Provide feedback