Make isAddress more async

[alexkeating]

Description

• Make isAddress more async, and handle errors in isAddress

Closes #373

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[garyghayrat]

lgtm!

[github-actions]

Coverage after merging chore/async-promise into master will be

86.45%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	93.55%	100%	75%	94.74%	85
UniswapWithdrawHook.sol	77.78%	100%	50%	80%	44
umbra-js/src
ethers.ts	86.27%	100%	75%	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	85.71%	86.67%	66.67%	87.50%	11, 26, 46, 50, 8
Umbra.ts	79.77%	74.19%	76%	83.66%	134–135, 211–212, 212–213, 222–223, 241, 287–290, 352, 360, 360–362, 364, 366, 386, 386, 386–387, 392–393, 396, 399, 415, 432–433, 481, 515, 532, 545–546, 556–557, 580–581, 657, 660, 660, 660, 663, 670, 670, 677, 681, 681, 681–682, 695, 699, 702–703, 709–711, 718, 718, 718–721
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	38.89%	25%	33.33%	44%	26–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
utils.ts	81.79%	73.15%	81.25%	87.43%	102, 120–121, 168, 221, 235–236, 236, 236, 259, 261–262, 271, 271, 271–272, 274, 277, 286–287, 331, 331, 331, 351, 374, 376, 381, 389–393, 396, 438–439, 439, 439–441, 441, 441, 541, 546, 58–59, 84, 92, 94–96
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%