Implement interfaces and update IKeyperSetManager

Author: konradkonrad

src/common/KeyperSet.sol

@@ -2,11 +2,12 @@
 pragma solidity ^0.8.22;
 
 import "./lib/openzeppelin/contracts/access/Ownable.sol";
+import "./intf/IKeyperSet.sol";
 
 error AlreadyFinalized();
 error NotRegistered();
 
-contract KeyperSet is Ownable {
+contract KeyperSet is Ownable, IKeyperSet {
     bool finalized;
     address[] members;
     uint64 threshold;

src/common/KeyperSetManager.sol

@@ -4,13 +4,11 @@ pragma solidity ^0.8.22;
 import "./lib/openzeppelin/contracts/utils/math/Math.sol";
 import "./KeyperSet.sol";
 import "./lib/RestrictedPausable.sol";
+import "./intf/IKeyperSetManager.sol";
 
-error KeyperSetNotFinalized();
-error AlreadyHaveKeyperSet();
-error NoActiveKeyperSet();
 error AlreadyDeactivated();
 
-contract KeyperSetManager is RestrictedPausable {
+contract KeyperSetManager is RestrictedPausable, IKeyperSetManager {
     struct KeyperSetData {
         uint64 activationBlock;
         address contractAddress;