feat(registry): add getallregistrants

bolt-contracts/src/contracts/BoltRegistry.sol

@@ -13,6 +13,9 @@ contract BoltRegistry is IBoltRegistry {
     // Mapping to hold the registrants
     mapping(address => Registrant) public registrants;
 
+    // Array to hold operator addresses
+    address[] public operators;
+
     // Mapping that holds the relationship between validator index and operator address
     mapping(uint64 => address) public delegations;
 
@@ -106,7 +109,7 @@ contract BoltRegistry is IBoltRegistry {
     /// @notice Check if an address is a based proposer opted into the protocol
     /// @param _operator The address to check
     /// @return True if the address is an active based proposer, false otherwise
-    function isActiveOperator(address _operator) external view returns (bool) {
+    function isActiveOperator(address _operator) public view returns (bool) {
         return registrants[_operator].status == Status.ACTIVE;
     }
 
@@ -129,4 +132,16 @@ contract BoltRegistry is IBoltRegistry {
 
         revert NotFound();
     }
+
+    function getAllRegistrants() external view returns (Registrant[] memory) {
+        Registrant[] memory _registrants = new Registrant[](operators.length);
+
+        for (uint256 i = 0; i < operators.length; i++) {
+            if (isActiveOperator(operators[i])) {
+                _registrants[i] = registrants[operators[i]];
+            }
+        }
+
+        return _registrants;
+    }
 }