[DMS-68] Use complex fold implementation (SLOW)

[s-and-witch]

In comparison with #12

	size	foldLeft	foldRight	mapfilter	map
persistentmap	100	78_976	77_023	157_425	29_048
persistentmap_baseline	100	18_597	18_509	157_384	29_048
persistentmap	1000	748_026	746_573	3_430_207	257_766
persistentmap_baseline	1000	154_997	153_509	2_355_770	1_332_475
persistentmap	10000	7_427_132	18_130_838

I didn't manage to get full results because it fails with error 143 without any message.

[GoPavel]

I didn't manage to get full results because it fails with error 143 without any message.

Maybe out of memory/gas?
But anyway it's already clear that it's much slower than the alternatives, interesting

[s-and-witch]

But anyway it's already clear that it's much slower than the alternatives, interesting

It's almost the same as #11

I can provide you another table, but I don't see that it's worth to compare slow folding implementations, as we already have a clear winner.