contracts-bedrock: add version getter to dgf, gas snapshot

packages/contracts-bedrock/.gas-snapshot

@@ -27,11 +27,11 @@ CrossDomainOwnable_Test:test_onlyOwner_notOwner_reverts() (gas: 10597)
 CrossDomainOwnable_Test:test_onlyOwner_succeeds() (gas: 34883)
 DeployerWhitelist_Test:test_owner_succeeds() (gas: 7582)
 DeployerWhitelist_Test:test_storageSlots_succeeds() (gas: 33395)
-DisputeGameFactory_Test:test_owner_succeeds() (gas: 7627)
-DisputeGameFactory_Test:test_setImplementation_notOwner_reverts() (gas: 11077)
-DisputeGameFactory_Test:test_setImplementation_succeeds() (gas: 38320)
-DisputeGameFactory_Test:test_transferOwnership_notOwner_reverts() (gas: 10979)
-DisputeGameFactory_Test:test_transferOwnership_succeeds() (gas: 13225)
+DisputeGameFactory_Test:test_owner_succeeds() (gas: 12610)
+DisputeGameFactory_Test:test_setImplementation_notOwner_reverts() (gas: 16099)
+DisputeGameFactory_Test:test_setImplementation_succeeds() (gas: 44302)
+DisputeGameFactory_Test:test_transferOwnership_notOwner_reverts() (gas: 15974)
+DisputeGameFactory_Test:test_transferOwnership_succeeds() (gas: 18694)
 FeeVault_Test:test_constructor_succeeds() (gas: 18185)
 GasBenchMark_L1CrossDomainMessenger:test_sendMessage_benchmark_0() (gas: 352135)
 GasBenchMark_L1CrossDomainMessenger:test_sendMessage_benchmark_1() (gas: 2950342)

packages/contracts-bedrock/contracts/dispute/DisputeGameFactory.sol

@@ -9,12 +9,13 @@ import { ClonesWithImmutableArgs } from "@cwia/ClonesWithImmutableArgs.sol";
 
 import { IDisputeGame } from "./interfaces/IDisputeGame.sol";
 import { IDisputeGameFactory } from "./interfaces/IDisputeGameFactory.sol";
+import { IVersioned } from "./interfaces/IVersioned.sol";
 
 /**
  * @title DisputeGameFactory
  * @notice A factory contract for creating `IDisputeGame` contracts.
  */
-contract DisputeGameFactory is OwnableUpgradeable, IDisputeGameFactory {
+contract DisputeGameFactory is OwnableUpgradeable, IDisputeGameFactory, IVersioned {
     /**
      * @dev Allows for the creation of clone proxies with immutable arguments.
      */
@@ -56,6 +57,13 @@ contract DisputeGameFactory is OwnableUpgradeable, IDisputeGameFactory {
         _transferOwnership(_owner);
     }
 
+    /**
+     * @inheritdoc IVersioned
+     */
+    function version() external pure returns (string memory) {
+        return "0.0.1";
+    }
+
     /**
      * @inheritdoc IDisputeGameFactory
      */