feat: add scroll integration

[zimpha]

Add scroll support.

❯ forge test --match-contract ScrollCrosschainTest -vvv

[⠢] Compiling...
No files changed, compilation skipped

Running 11 tests for test/ScrollCrossChainTest.t.sol:ScrollCrosschainTest
[PASS] testFuzz_actionExecutionFailsAfterGracePeriod(uint256) (runs: 256, μ: 1391457, ~: 1391593)
[PASS] testFuzz_actionExecutionFailsBeforeTimelock(uint256) (runs: 256, μ: 1389573, ~: 1389716)
[PASS] testFuzz_basicCrosschainPayloadExecution(uint256) (runs: 256, μ: 1403902, ~: 1404022)
[PASS] test_canceledActionCannotBeCanceled() (gas: 1390229)
[PASS] test_canceledActionCannotBeExecuted() (gas: 1390147)
[PASS] test_executedActionCannotBeCanceled() (gas: 1396413)
[PASS] test_executingMultipleActions() (gas: 6991570)
[PASS] test_expiredActionCannotBeCanceled() (gas: 1383597)
[PASS] test_nonExistentActionExecutionFails() (gas: 7955)
[PASS] test_onlyGuardianCanCancel() (gas: 1424987)
[PASS] test_selfReconfiguration() (gas: 1673867)
Test result: ok. 11 passed; 0 failed; 0 skipped; finished in 28.35s

Ran 1 test suites: 11 tests passed, 0 failed, 0 skipped (11 total tests)