🚀 Add new PaymasterStake script for staking

- Add new script for easy staking of funds into
Paymaster contracts with configurable delay

This operation is required because the paymaster
access it own storage

script/Paymaster/12_PaymasterStake.s.sol

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: APACHE-2.0
+pragma solidity >=0.8.19 <0.9.0;
+
+import { Paymaster } from "src/v1/Paymaster.sol";
+import { BaseScript } from "../Base.s.sol";
+
+// 1 day -- Alchemy's recommended unstake delay
+uint256 constant DEFAULT_UNSTAKE_DELAY_SEC = 60 * 60 * 24;
+
+/// @title  PaymasterStake
+/// @notice Stake some funds for the paymaster into the entrypoint
+contract PaymasterStake is BaseScript {
+    function run() public payable broadcast {
+        address paymasterAddress = vm.envAddress("PAYMASTER");
+        uint256 value = vm.envUint("AMOUNT");
+        uint32 unstakeDelaySec = uint32(vm.envOr("UNSTAKE_DELAY_SEC", DEFAULT_UNSTAKE_DELAY_SEC));
+
+        Paymaster paymaster = Paymaster(paymasterAddress);
+
+        // stake some funds for the paymaster into the entrypoint
+        paymaster.addStake{ value: value }(unstakeDelaySec);
+    }
+}