Move DOMAIN_SEPARATOR to authorize operator interface

[hieronx]

No description provided.

[github-actions]

Coverage after merging operator-interface into main will be

89.30%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
Auth.sol	100%	100%	100%	100%
CentrifugeRouter.sol	54.92%	37.50%	81.25%	59.09%	107, 120, 120, 131, 136, 138–139, 139–140, 142–143, 143, 147–148, 148, 150, 150, 156, 161, 161–163, 163, 163, 24–25, 27–28, 32, 39, 39, 53–55, 55–56, 64, 67, 76–77, 77, 77–78, 80–81, 81, 81, 83–85, 91, 95
ERC7540Vault.sol	82.42%	70.83%	93.02%	80.61%	107, 127, 133, 175–177, 202–204, 230–232, 244, 70–76, 78–81, 83–84
Escrow.sol	100%	100%	100%	100%
InvestmentManager.sol	90.65%	88.04%	86.36%	92.97%	134, 248, 257, 301, 330, 352, 384, 388–389, 511, 554–557, 566–569, 569, 569, 60–61, 63–64
PoolManager.sol	95.39%	99.06%	76.92%	95.93%	201, 204, 64–67, 69–70
Root.sol	92.11%	88.89%	92.86%	93.18%	124, 129, 149–150, 38
src/admin
Guardian.sol	66.67%	50%	77.78%	63.64%	23–25, 29, 29, 63
src/factories
ERC7540VaultFactory.sol	100%	100%	100%	100%
RestrictionManagerFactory.sol	66.67%	100%	50%	70%	23, 25–26
TrancheTokenFactory.sol	100%	100%	100%	100%
TransferProxyFactory.sol	100%	100%	100%	100%
src/gateway
Gateway.sol	88.46%	100%	80%	81.48%	41–43, 45–46
src/gateway/routers
Aggregator.sol	89.26%	80%	83.33%	95.40%	100, 109–110, 114, 153, 156–157, 160, 169, 40, 42–43, 49, 51
src/gateway/routers/axelar
Forwarder.sol	80%	100%	75%	75%	38, 40–41
Router.sol	84.21%	100%	66.67%	75%	34–35
src/token
ERC20.sol	97.12%	94.12%	100%	98.31%	161, 60–61
RestrictionManager.sol	94.83%	100%	66.67%	100%
Tranche.sol	77.14%	62.50%	72.73%	87.50%	55, 64, 73, 83, 93