Updated the sweep function and wrote some comprehensive tests

[jalextowle]

This PR removes the concept of sweepTargets from the repo and implements a balance check to make this approach safe.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: 04cb6ca	Previous: aadaa99	Deviation	Status
addLiquidity: min	1600 gas	1600 gas	0%	🟰
addLiquidity: avg	66750 gas	55098 gas	21.1478%	🚨
addLiquidity: max	275046 gas	232446 gas	18.3268%	🚨
checkpoint: min	1172 gas	1172 gas	0%	🟰
checkpoint: avg	48038 gas	47937 gas	0.2107%	🚨
checkpoint: max	202123 gas	202123 gas	0%	🟰
closeLong: min	1580 gas	1580 gas	0%	🟰
closeLong: avg	27900 gas	26510 gas	5.2433%	🚨
closeLong: max	147816 gas	139624 gas	5.8672%	🚨
closeShort: min	1549 gas	1549 gas	0%	🟰
closeShort: avg	29995 gas	28777 gas	4.2325%	🚨
closeShort: max	147189 gas	144389 gas	1.9392%	🚨
initialize: min	1538 gas	1538 gas	0%	🟰
initialize: avg	214974 gas	181786 gas	18.2566%	🚨
initialize: max	256760 gas	256760 gas	0%	🟰
openLong: min	1509 gas	1509 gas	0%	🟰
openLong: avg	50165 gas	40502 gas	23.8581%	🚨
openLong: max	185904 gas	162207 gas	14.6091%	🚨
openShort: min	1519 gas	1519 gas	0%	🟰
openShort: avg	47392 gas	47335 gas	0.1204%	🚨
openShort: max	161536 gas	161536 gas	0%	🟰
redeemWithdrawalShares: min	1575 gas	1575 gas	0%	🟰
redeemWithdrawalShares: avg	23340 gas	18465 gas	26.4013%	🚨
redeemWithdrawalShares: max	105958 gas	84767 gas	24.9991%	🚨
removeLiquidity: min	1661 gas	1661 gas	0%	🟰
removeLiquidity: avg	148623 gas	118880 gas	25.0193%	🚨
removeLiquidity: max	323560 gas	258848 gas	25%	🚨

This comment was automatically generated by workflow using github-action-benchmark.

[coveralls]

coverage: 95.238% (+0.2%) from 95.057%
when pulling 04cb6ca on jalextowle/instance/sweep-targets
into aadaa99 on main.

[jrhea]

lgtm