feat: add ZkEVMBridgeExecutor

[0xdapper]

Pulled and little changed from aave/governance-crosschain-bridges#78

❯ forge test --mc ZkEVMCrosschainTest
[⠢] Compiling...
No files changed, compilation skipped

Running 11 tests for test/ZkEVMBridgeExecutor.t.sol:ZkEVMCrosschainTest
[PASS] testFuzz_actionExecutionFailsAfterGracePeriod(uint256) (runs: 256, μ: 1035293, ~: 1035445)
[PASS] testFuzz_actionExecutionFailsBeforeTimelock(uint256) (runs: 256, μ: 1033439, ~: 1033568)
[PASS] testFuzz_basicCrosschainPayloadExecution(uint256) (runs: 256, μ: 1047867, ~: 1047965)
[PASS] test_canceledActionCannotBeCanceled() (gas: 1034080)
[PASS] test_canceledActionCannotBeExecuted() (gas: 1033998)
[PASS] test_executedActionCannotBeCanceled() (gas: 1040355)
[PASS] test_executingMultipleActions() (gas: 4174564)
[PASS] test_expiredActionCannotBeCanceled() (gas: 1027536)
[PASS] test_nonExistentActionExecutionFails() (gas: 7955)
[PASS] test_onlyGuardianCanCancel() (gas: 1068924)
[PASS] test_selfReconfiguration() (gas: 1317935)
Test result: ok. 11 passed; 0 failed; 0 skipped; finished in 14.06s

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

[hexonaut]

Need some changes, and there is a critical security issue.

[hexonaut]

Looking better, but still need some changes.

[hexonaut]

Good to merge after Polygon has internal reviewer/auditor.

[barrutko]

test/ZkEVMBridgeExecutor.t.sol should be renamed to test/ZkEVMCrosschainTest.t.sol.

Other than that LGTM.