Remove unsorted state

[alexkeating]

Description

• Sort order does not become confused when the unsorted state is removed

Closes #540

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[garyghayrat]

lgtm!

[github-actions]

Coverage after merging bug/fix-sort into master will be

85.46%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	93.55%	100%	75%	94.74%	96
UniswapWithdrawHook.sol	77.78%	100%	50%	80%	44
umbra-js/src
ethers.ts	76.27%	100%	61.11%	100%
types.ts	50%	100%	0%	100%
umbra-js/src/classes
KeyPair.ts	98.65%	96.49%	100%	100%	31–32
RandomNumber.ts	100%	100%	100%	100%
StealthKeyRegistry.ts	100%	100%	100%	100%
TxHistoryProvider.ts	75%	73.68%	66.67%	76.67%	11, 11, 20–21, 32, 39, 39, 43, 47, 56, 60, 8
Umbra.ts	76.67%	64.67%	83.33%	83.81%	125, 128–129, 150, 224–226, 310–313, 375, 383, 383–385, 387, 389, 409, 409, 409–410, 414, 417, 438, 455–456, 538, 555, 568–569, 579–580, 593, 596–597, 627–628, 704, 708, 708, 708–711, 711, 711, 711, 711, 711, 711–712, 712, 712, 712, 712, 712, 712, 712, 712, 712, 712, 714, 714, 714–715, 718, 718, 718, 718, 718–719, 722, 729, 729, 738, 742, 742, 742–743, 756, 760, 763–764, 770–772, 779, 779, 779–782, 813, 818–819, 819–820, 98
umbra-js/src/utils
cns.ts	50%	33.33%	50%	55%	33–36, 40, 40, 40, 40, 40–41, 44–46
constants.ts	100%	100%	100%	100%
ens.ts	36.11%	25%	33.33%	40%	25–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
utils.ts	80.65%	71.67%	86.67%	86.29%	107–109, 111–113, 119, 137–138, 167, 185, 238, 264, 266–267, 276, 276, 276–277, 279, 282, 291–292, 336, 336, 336, 356, 385, 387, 392, 404, 404–405, 410, 412–413, 424–428, 434, 436, 478–479, 479, 479–481, 481, 481, 57–58, 581, 586, 83, 91, 91
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%

[apbendi]

Added #550 to track amount based sorting improvements. Otherwise LGTM!