introduce the category of Bounded posets #24854

Job	Run time
test-long (src/sage/[a-f]*)	52m 32s
test-long (src/doc src/sage_docbuild src/sage_setup)	23m 59s
test-long (src/sage/[g-o]*)	48m 37s
test-long (src/sage/[p-z]*)	59m 3s
coverage-report	16m 48s
test-long (src/sage/[p-z]*)	50m 49s
test-long (src/doc src/sage_docbuild src/sage_setup)	23m 59s
test-long (src/sage/[g-o]*)	48m 37s
test-long (src/sage/[a-f]*)	52m 32s
coverage-report	19m 44s
	6h 36m 40s

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