merge MontgomeryEquivalence into MontgomeryLadder #417

Job	Run time
docker-master	1h 36m 59s
publish-standalone-dry-run	14s
test-standalone (master, dev, default)	57s
build-js-of-ocaml (master, 4.11.1)	14m 40s
validate-docker-master	1m 12s
generated-files (master)	27m 4s
build-wasm-of-ocaml (master, 4.14.1)	13m 43s
standalone-haskell (master)	53m 59s
test-amd64	2h 20m 17s
deploy-js-wasm-of-ocaml	42s
docker-check-all	9s
	5h 49m 56s

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