Small fix from server work

[StanislavBreadless]

What ❔

• Fixed BalanceChange initialization
• We can not import master OZ repo without breaking factory deps. For now I just cloned the relevant libraries

Why ❔

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.

[0xValera]

lgtm

[github-actions]

Coverage after merging sb/fix-kl-medium-interop-server into kl/medium-interop will be

78.23%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts/bridge
BridgeHelper.sol	100%	100%	100%	100%
BridgedStandardERC20.sol	96.25%	100%	92.31%	97.01%	231–232
L1ERC20Bridge.sol	97.78%	100%	100%	97.37%	261
L1Nullifier.sol	88.27%	100%	86.67%	88.55%	128–129, 181, 190, 414–415, 418, 444, 627, 629, 673, 685, 688, 690, 703, 716–717, 721–722
contracts/bridge/asset-router
AssetRouterBase.sol	98.55%	100%	100%	98.25%	122
L1AssetRouter.sol	92.07%	100%	89.66%	92.59%	102, 314, 325, 407–408, 428, 586, 597, 611, 616
contracts/bridge/asset-tracker
AssetTrackerBase.sol	66.67%	100%	63.64%	68%	54–55, 64–65, 77–78, 81–82
GWAssetTracker.sol	27.73%	100%	35.48%	26.46%	105, 109, 112–113, 116–117, 120–121, 124–125, 132–133, 175, 178–179, 182, 184–188, 190, 192, 194–198, 200–201, 203–204, 206–214, 216, 218, 220, 222–224, 229–230, 239, 241–242, 248, 255–258, 260–261, 263, 265–269, 271–272, 276–281, 287–288, 291–292, 296–297, 299, 302, 304–305, 307–308, 310–311, 315–316, 319–320, 322–323, 325, 330, 332, 334, 338, 348, 355, 359–361, 363, 371, 377, 379–380, 382–383, 388–389, 391, 396, 398, 402, 408–409, 413, 419–421, 503, 506, 62–64, 69–71, 76–78, 93–95, 97–99
L1AssetTracker.sol	72.55%	100%	72%	72.66%	113–115, 118–121, 123–126, 131–133, 146–148, 199, 203–207, 238, 359, 46–47, 58–59, 62–63, 73–76
LegacySharedBridgeAddresses.sol	0%	100%	0%	0%	23, 26, 29, 32, 36–41, 43
contracts/bridge/interfaces
AssetHandlerModifiers.sol	75%	100%	100%	66.67%	13
contracts/bridge/ntv
L1NativeTokenVault.sol	73.58%	100%	77.27%	72.62%	100–102, 149, 153–155, 178–184, 186, 250–251, 253, 264, 266, 270, 91–92
NativeTokenVaultBase.sol	89.33%	100%	85.71%	90%	107, 112, 116–117, 150–153, 155–156, 158, 564–565, 569–570
UpgradeableBeaconDeployer.sol	0%	100%	0%	0%	15–16, 18, 20–21
contracts/bridgehub
BridgehubBase.sol	74.06%	100%	76.32%	73.56%	134–136, 144, 152, 157–159, 166, 184, 222–223, 229–230, 239, 252–254, 256–257, 259, 261, 293, 296, 315, 331, 362, 400–401, 508, 512, 516–517, 536, 539, 595, 599, 602, 637–638, 642–643, 651–652, 656–657
CTMDeploymentTracker.sol	73.47%	100%	81.82%	71.05%	107, 111, 115, 140, 144–145, 33, 41, 66, 79–80
ChainAssetHandlerBase.sol	57.73%	100%	50%	59.04%	103–105, 110–112, 133–135, 141–144, 147–148, 199, 202, 214–215, 270, 287, 345, 349, 351, 353–354, 363–364, 368–369, 82, 89–90, 98
ChainRegistrationSender.sol	88.24%	100%	100%	85.19%	41, 85, 89, 95
L1Bridgehub.sol	89.42%	100%	92.31%	89.01%	100, 217, 292, 296–297, 300, 310, 66–67, 87
L1ChainAssetHandler.sol	81.25%	100%	75%	83.33%	42–43, 58–59
L1MessageRoot.sol	60.98%	100%	85.71%	55.88%	51–52, 56–58, 61–62, 67–68, 73–74, 78–79, 94–95
L2Bridgehub.sol	47.83%	100%	40%	50%	105–106, 114, 116–117, 126, 131–132, 134–135, 47, 49–52, 78, 91–92
L2ChainAssetHandler.sol	73.53%	100%	66.67%	76%	47–48, 67–68, 74, 98
L2MessageRoot.sol	75.51%	100%	72.73%	76.32%	103, 49–50, 53, 60, 65–66, 90–91
MessageRootBase.sol	82.58%	100%	95%	80.36%	105–108, 110–111, 113, 117, 123–125, 133, 150, 160, 165, 170, 172–173, 230, 246, 319, 344
contracts/common
MessageVerification.sol	94.12%	100%	87.50%	96.15%	142
ReentrancyGuard.sol	95%	100%	100%	94.12%	79
contracts/common/l2-helpers
L2ContractHelper.sol	84.91%	100%	100%	82.22%	102, 108, 112, 129, 134, 73, 79, 83
SystemContractsCaller.sol	52.50%	100%	60%	51.43%	44–45, 47, 49, 51, 53, 66, 69, 72, 75, 78, 83, 89, 91, 93, 96, 98
contracts/common/libraries
DataEncoding.sol	84.21%	100%	88.24%	83.33%	112–113, 120–121, 166, 180, 208, 216–217, 228, 242, 253, 48
DynamicIncrementalMerkle.sol	81.03%	100%	85.71%	80.39%	143–146, 148–151, 153–154
DynamicIncrementalMerkleMemory.sol	98.96%	100%	100%	98.84%	196
FullMerkle.sol	100%	100%	100%	100%
FullMerkleMemory.sol	85.86%	100%	100%	84.78%	114, 131, 149, 163, 89–98
Merkle.sol	98.15%	100%	100%	97.96%	83
MessageHashing.sol	96%	100%	100%	95.38%	118, 135, 154
SemVer.sol	100%	100%	100%	100%
UncheckedMath.sol	100%	100%	100%	100%
UnsafeBytes.sol	100%	100%	100%	100%
contracts/common/libraries/TransientPrimitives
TransientPrimitives.sol	100%	100%	100%	100%
contracts/governance
AccessControlRestriction.sol	100%	100%	100%	100%
ChainAdmin.sol	97.87%	100%	100%	97.30%	39
ChainAdminOwnable.sol	44.83%	100%	40%	45.83%	28, 38–40, 46–48, 57, 66, 77–79, 81
Governance.sol	100%	100%	100%	100%