Add method 'genSizedList' to class Foldy #16826

Job	Run time
gen-hie	5m 39s
fourmolu	54s
Check branch history	9s
build (8.10.7, ubuntu-latest)	32m 50s
build (9.2.8, ubuntu-latest)	16m 7s
cabal-format	5s
Check if formal-ledger-specifications SRP is valid	10s
build (9.6.6, ubuntu-latest)	18m 50s
build (9.8.4, ubuntu-latest)	4m 1s
build (9.10.1, ubuntu-latest)	4m 19s
${{ matrix.package }}-${{ matrix.ghc }}-${{ matrix.os }}	0s
Tests completed	1s
Send a slack notification on \#ledger-internal if the nightly build failed	0s
	1h 23m 5s

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