Add pmap_from_psphere_iterated_loops, and needed lemmas #1705

Job	Run time
nix	2m 7s
opam-build (supported, ubuntu-latest)	3m 28s
build (supported)	2m 30s
quick-build (supported, ubuntu-latest)	2m 15s
build (latest)	2m 27s
quick-build (latest, ubuntu-latest)	2m 13s
build (dev, --warnings)	2m 39s
quick-build (dev, ubuntu-latest)	2m 18s
opam-build (8.17, ubuntu-latest)	3m 23s
opam-build (latest, ubuntu-latest)	3m 21s
opam-build (dev, ubuntu-latest)	3m 30s
doc-coqdoc	0s
coqchk	0s
doc-alectryon	0s
doc-dep-graphs	0s
doc-timing	0s
install	0s
deploy-doc	0s
delete-artifacts	6s
	30m 17s

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