Escrow updates for ASv2 (#9636)

* Implement transferWithTrustedIssuers

* Update transfer and revoke tests

* Implement withdraw and mock tests

* Nits: fix linting, remove some TODOs, reformat text in tests

* Add logic for setting defaultTrustedIssuers

* Simplify transfer logic and docstrings and add unset event

* Reorder escrow functions based on solidity style guide

* Nit remove TODOs

* Use FederatedAttestations instead of MockFA in escrow tests

* Address PR comments

* Remove redundant comments

packages/protocol/contracts/common/UsingRegistry.sol

@@ -15,6 +15,7 @@ import "../governance/interfaces/IValidators.sol";
 
 import "../identity/interfaces/IRandom.sol";
 import "../identity/interfaces/IAttestations.sol";
+import "../identity/interfaces/IFederatedAttestations.sol";
 
 import "../stability/interfaces/IExchange.sol";
 import "../stability/interfaces/IReserve.sol";
@@ -36,6 +37,9 @@ contract UsingRegistry is Ownable {
   bytes32 constant FEE_CURRENCY_WHITELIST_REGISTRY_ID = keccak256(
     abi.encodePacked("FeeCurrencyWhitelist")
   );
+  bytes32 constant FEDERATED_ATTESTATIONS_REGISTRY_ID = keccak256(
+    abi.encodePacked("FederatedAttestations")
+  );
   bytes32 constant FREEZER_REGISTRY_ID = keccak256(abi.encodePacked("Freezer"));
   bytes32 constant GOLD_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("GoldToken"));
   bytes32 constant GOVERNANCE_REGISTRY_ID = keccak256(abi.encodePacked("Governance"));
@@ -92,6 +96,10 @@ contract UsingRegistry is Ownable {
     return IFeeCurrencyWhitelist(registry.getAddressForOrDie(FEE_CURRENCY_WHITELIST_REGISTRY_ID));
   }
 
+  function getFederatedAttestations() internal view returns (IFederatedAttestations) {
+    return IFederatedAttestations(registry.getAddressForOrDie(FEDERATED_ATTESTATIONS_REGISTRY_ID));
+  }
+
   function getFreezer() internal view returns (IFreezer) {
     return IFreezer(registry.getAddressForOrDie(FREEZER_REGISTRY_ID));
   }