feat(protocol): add a view function isSignalReceived for Bridge relayer/UI

[dantaik]

isSignalReceived has the same implementation as proveSignalReceived except it doesn't transact to cache data.

[openzeppelin-code]

feat(protocol): add a view function isSignalReceived for Bridge relayer/UI

Generated at commit: 5a31d9e25dbb0c3a8a7c6c06e92fdfda8e894b17

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 2 0 3 39 46
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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[Brechtpd]

function isSignalReceived(
        uint64 _chainId,
        address _app,
        bytes32 _signal,
        bytes calldata _proof) 
  external 
  view
{
  bytes memory call_data = abi.encodePacked(SignalService.proveSignalReceived.selector, msg.data[4:]);
  (bool success, ) = address(this).staticcall(call_data);
  require(success);
}

Something like this should also work (though I have only tested with dummy functions) so the code doesn't have to be duplicated, though it would require the caller to disable any caching manually instead of the current way where it is simply ignored no matter the value.